{"id":394363,"date":"2024-10-08T17:04:06","date_gmt":"2024-10-08T10:04:06","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=394363"},"modified":"2024-10-08T17:04:06","modified_gmt":"2024-10-08T10:04:06","slug":"cach-bam-cot-tren-may-tinh","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/cach-bam-cot-tren-may-tinh\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn t\u00ednh sin, cos, tan, c\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Sin, cos, tan, cot l\u00e0 nh\u1eefng t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u00e1c b\u1ea1n s\u1ebd \u0111\u01b0\u1ee3c l\u00e0m quen trong m\u00f4n to\u00e1n l\u1edbp 9. Vi\u1ec7c n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft v\u1ec1 t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a g\u00f3c nh\u1ecdn s\u1ebd gi\u00fap c\u00e1c b\u1ea1n h\u1ecdc sinh l\u00e0m t\u1ed1t b\u00e0i t\u1eadp. \u0110\u1ec3 t\u1ed1i \u01b0u ho\u00e1 th\u1eddi gian gi\u1ea3i b\u00e0i t\u1eadp, ch\u00fang t\u00f4i s\u1ebd h\u01b0\u1edbng d\u1eabn c\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh v\u00e0 m\u1ed9t s\u1ed1 h\u00e0m kh\u00e1c, m\u1eddi c\u00e1c b\u1ea1n theo d\u00f5i!\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">L\u00fd thuy\u1ebft v\u1ec1 t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c g\u00f3c nh\u1ecdn\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">T\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a g\u00f3c nh\u1ecdn l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n h\u1ecdc t\u1eeb l\u1edbp 9 \u0111\u1ebfn l\u1edbp 12 v\u00e0 c\u00f3 \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u d\u1ea1ng to\u00e1n kh\u00e1c nhau. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u00e0 chi ti\u1ebft m\u00e0 h\u1ecdc sinh c\u1ea7n n\u1eafm v\u1eefng v\u1ec1 l\u01b0\u1ee3ng gi\u00e1c:\u00a0\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">\u0110\u1ecbnh ngh\u0129a<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">V\u1edbi m\u1ed9t tam gi\u00e1c vu\u00f4ng c\u00f3 g\u00f3c nh\u1ecdn \ud835\udefc, c\u00e1c t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u01a1 b\u1ea3n \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a nh\u01b0 sau:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Sin (k\u00fd hi\u1ec7u l\u00e0 sin\u2061 \u03b1): L\u00e0 t\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh \u0111\u1ed1i c\u1ee7a g\u00f3c \u03b1 v\u00e0 c\u1ea1nh huy\u1ec1n.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">sin \u03b1 = <\/span><span style=\"font-weight: 400;\">c\u1ea1nh \u0111\u1ed1i\/<\/span><span style=\"font-weight: 400;\">c\u1ea1nh huy\u1ec1n<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Cosin (k\u00fd hi\u1ec7u l\u00e0 co s\u2061\u03b1): L\u00e0 t\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh k\u1ec1 c\u1ee7a g\u00f3c \u03b1 v\u00e0 c\u1ea1nh huy\u1ec1n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">cos \u03b1 = <\/span><span style=\"font-weight: 400;\">c\u1ea1nh k\u1ec1\/<\/span><span style=\"font-weight: 400;\">c\u1ea1nh huy\u1ec1n<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tangent (k\u00fd hi\u1ec7u l\u00e0 tan\u2061 \u03b1): L\u00e0 t\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh \u0111\u1ed1i c\u1ee7a g\u00f3c \u03b1 v\u00e0 c\u1ea1nh k\u1ec1.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">tan \u03b1 = <\/span><span style=\"font-weight: 400;\">c\u1ea1nh \u0111\u1ed1i\/<\/span><span style=\"font-weight: 400;\">c\u1ea1nh k\u1ec1<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Cotangent (k\u00fd hi\u1ec7u l\u00e0 cot\u2061 \u03b1): L\u00e0 t\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh k\u1ec1 c\u1ee7a g\u00f3c \u03b1 v\u00e0 c\u1ea1nh \u0111\u1ed1i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">cot \u03b1 = <\/span><span style=\"font-weight: 400;\">c\u1ea1nh k\u1ec1\/<\/span><span style=\"font-weight: 400;\">c\u1ea1nh \u0111\u1ed1i<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-2.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-2-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-2-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-394407 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-2.jpg\" alt=\"cach-bam-cot-tren-may-tinh-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">VD: Tam gi\u00e1c ABC vu\u00f4ng t\u1ea1i A, v\u1edbi g\u00f3c \u03b1 = \u2220ACB, ch\u00fang ta c\u00f3:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">AC l\u00e0 c\u1ea1nh k\u1ec1 c\u1ee7a g\u00f3c \u03b1<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">AB l\u00e0 c\u1ea1nh \u0111\u1ed1i c\u1ee7a g\u00f3c \u03b1<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">BC l\u00e0 c\u1ea1nh huy\u1ec1n (c\u1ea1nh d\u00e0i nh\u1ea5t trong tam gi\u00e1c vu\u00f4ng). C\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh trong tam gi\u00e1c vu\u00f4ng ABC s\u1ebd \u0111\u01b0\u1ee3c ch\u00fang t\u00f4i h\u01b0\u1edbng d\u1eabn trong ph\u1ea7n ti\u1ebfp theo.\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">T\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a g\u00f3c \u03b1\\alpha\u03b1 \u0111\u01b0\u1ee3c t\u00ednh nh\u01b0 sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Sin \u03b1: L\u00e0 t\u1ec9 s\u1ed1 gi\u1eefa c\u1ea1nh \u0111\u1ed1i AB v\u00e0 c\u1ea1nh huy\u1ec1n BC, sin \u03b1 = AB\/BC\u00a0\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Cos \u03b1: L\u00e0 t\u1ec9 s\u1ed1 c\u1ee7a c\u1ea1nh k\u1ec1 AC v\u1edbi c\u1ea1nh huy\u1ec1n BC, cos \u03b1 = AC\/ BC\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Tan \u03b1: L\u00e0 t\u1ec9 s\u1ed1 c\u1ee7a c\u1ea1nh \u0111\u1ed1i AB v\u1edbi c\u1ea1nh k\u1ec1 AC, tan \u03b1 = AB\/ AC<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Cot \u03b1: L\u00e0 t\u1ec9 s\u1ed1 c\u1ee7a c\u1ea1nh k\u1ec1 AC v\u1edbi c\u1ea1nh \u0111\u1ed1i AB, cot \u03b1 = AC\/ AB.\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Nh\u1eefng c\u00f4ng th\u1ee9c tr\u00ean \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u0111\u1ec3 t\u00ednh c\u00e1c t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a g\u00f3c nh\u1ecdn \u03b1 trong tam gi\u00e1c vu\u00f4ng ABC.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">T\u00ednh ch\u1ea5t c\u1ee7a t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a g\u00f3c nh\u1ecdn<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">T\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a g\u00f3c nh\u1ecdn c\u00f3 m\u1ed9t s\u1ed1 t\u00ednh ch\u1ea5t quan tr\u1ecdng gi\u00fap h\u1ecdc sinh d\u1ec5 d\u00e0ng gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n li\u00ean quan \u0111\u1ebfn l\u01b0\u1ee3ng gi\u00e1c. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">T\u00ednh ch\u1ea5t 1: Li\u00ean h\u1ec7 gi\u1eefa c\u00e1c g\u00f3c ph\u1ee5 nhau\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u1ebfu hai g\u00f3c ph\u1ee5 nhau (t\u1ee9c l\u00e0 t\u1ed5ng c\u1ee7a ch\u00fang b\u1eb1ng 90 \u0111\u1ed9), th\u00ec c\u00e1c t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a ch\u00fang c\u00f3 c\u00e1c m\u1ed1i quan h\u1ec7 nh\u01b0 sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Sin c\u1ee7a m\u1ed9t g\u00f3c b\u1eb1ng Cos c\u1ee7a g\u00f3c kia.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Cos c\u1ee7a m\u1ed9t g\u00f3c b\u1eb1ng Sin c\u1ee7a g\u00f3c kia.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Tan c\u1ee7a m\u1ed9t g\u00f3c b\u1eb1ng Cot c\u1ee7a g\u00f3c kia.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Cot c\u1ee7a m\u1ed9t g\u00f3c b\u1eb1ng Tan c\u1ee7a g\u00f3c kia.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5: N\u1ebfu hai g\u00f3c \u03b1 v\u00e0 \u03b2 c\u00f3 t\u1ed5ng \u03b1+\u03b2=90\u2218, th\u00ec ta c\u00f3:\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">sin \u03b1=cos \u03b2<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">cos\u2061 \u03b1=sin\u2061 \u03b2<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">tan\u2061 \u03b1=cot\u2061 \u03b2<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">cot\u2061 \u03b1=tan \u2061\u03b2<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">C\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh c\u0169ng nh\u01b0 sin, cos, tan c\u0169ng r\u1ea5t \u0111\u01a1n gi\u1ea3n, n\u1eafm \u0111\u01b0\u1ee3c t\u00ednh ch\u1ea5t n\u00e0y c\u00e1c b\u1ea1n s\u1ebd d\u1ec5 d\u00e0ng gi\u1ea3i to\u00e1n nhanh ch\u00f3ng.\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-3.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-3-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-3-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"size-full wp-image-394408 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-3.jpg\" alt=\"cach-bam-cot-tren-may-tinh-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">T\u00ednh ch\u1ea5t 2: T\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a hai g\u00f3c b\u1eb1ng nhau.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u1ebfu hai g\u00f3c \u03b1 v\u00e0 \u03b2 b\u1eb1ng nhau th\u00ec c\u00e1c t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a ch\u00fang c\u0169ng b\u1eb1ng nhau. C\u1ee5 th\u1ec3:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">sin \u03b1=sin \u03b2<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">cos \u2061\u03b1=cos \u2061\u03b2<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">tan\u2061 \u03b1=tan\u2061 \u03b2<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">cot\u2061 \u03b1=cot \u2061\u03b2<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">T\u00ednh ch\u1ea5t 3: C\u00f4ng th\u1ee9c l\u01b0\u1ee3ng gi\u00e1c trong tam gi\u00e1c vu\u00f4ng\u00a0<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">0 &lt; sin \u03b1 &lt; 1; 0 &lt; cos \u03b1 &lt; 1, tan \u03b1 &gt; 0; cot \u03b1 &gt; 0<\/span><\/li>\n<li><span style=\"font-weight: 400;\">(sin\u03b1)^2 + (cos\u03b1)^2 = 1; tan \u03b1 x cot \u03b1 = 1\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\">tan \u03b1 = sin \u03b1\/cos \u03b1; cot \u03b1 = cos \u03b1\/sin \u03b1<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400;\">Gi\u00e1 tr\u1ecb l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a c\u00e1c g\u00f3c \u0111\u1eb7c bi\u1ec7t\u00a0<\/span><\/h3>\n<table style=\"height: 237px;\" width=\"771\">\n<tbody>\n<tr>\n<td style=\"text-align: center;\"><strong>G\u00f3c \u03b1<\/strong><\/td>\n<td style=\"text-align: center;\"><strong>sin \u03b1<\/strong><\/td>\n<td style=\"text-align: center;\"><strong>cos \u03b1<\/strong><\/td>\n<td style=\"text-align: center;\"><strong>tan \u03b1<\/strong><\/td>\n<td style=\"text-align: center;\"><strong>cot \u03b1<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">0\u00b0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Kh\u00f4ng x\u00e1c \u0111\u1ecbnh<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">30\u00b0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">1\/2<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">3<\/span><span style=\"font-weight: 400;\">\/ 2<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">1\/ <\/span><span style=\"font-weight: 400;\">3<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">3<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">45\u00b0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">\/ 2<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">\/ 2<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">60\u00b0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">3<\/span><span style=\"font-weight: 400;\">\/ 2<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">1\/ 2<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">3<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">1\/ <\/span><span style=\"font-weight: 400;\">3<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">90\u00b0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Kh\u00f4ng x\u00e1c \u0111\u1ecbnh<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span style=\"font-weight: 400;\">So s\u00e1nh c\u00e1c t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c\u00a0<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Tr\u01b0\u1edbc khi bi\u1ebft c\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh, c\u00e1c b\u1ea1n c\u1ea7n n\u1eafm \u0111\u01b0\u1ee3c m\u1ed1i quan h\u1ec7 so s\u00e1nh gi\u1eefa c\u00e1c t\u1ec9 s\u1ed1. Cho hai g\u00f3c nh\u1ecdn c\u1ee7a m\u1ed9t tam gi\u00e1c vu\u00f4ng l\u00e0 \u03b1, \u03b2, n\u1ebfu \u03b1 &lt; \u03b2, ta c\u00f3 c\u00e1c m\u1ed1i quan h\u1ec7 sau:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u1edbi sin v\u00e0 tan: Khi g\u00f3c \u03b1 nh\u1ecf h\u01a1n g\u00f3c \u03b2 ( \u03b1 &lt; \u03b2) th\u00ec:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">sin \u03b1 &lt; sin \u03b2 (t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a g\u00f3c nh\u1ecf h\u01a1n s\u1ebd nh\u1ecf h\u01a1n).\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">tan \u03b1 &lt; tan \u03b2 (g\u00f3c nh\u1ecf h\u01a1n s\u1ebd c\u00f3 tang nh\u1ecf h\u01a1n).<\/span><\/li>\n<\/ul>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-4.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-4-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-4-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"size-full wp-image-394409 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-4.jpg\" alt=\"cach-bam-cot-tren-may-tinh-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">V\u1edbi cos v\u00e0 cot: Khi g\u00f3c \u03b1 nh\u1ecf h\u01a1n g\u00f3c \u03b2 (\u03b1 &lt; \u03b2) th\u00ec:\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">cos \u03b1 &gt; cos \u03b2 (t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a cosin s\u1ebd gi\u1ea3m khi g\u00f3c t\u0103ng).\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">cot \u03b1 &gt; cot \u03b2 (cotang c\u1ee7a g\u00f3c nh\u1ecf h\u01a1n s\u1ebd l\u1edbn h\u01a1n).\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">So s\u00e1nh gi\u1eefa c\u00e1c t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a c\u00f9ng m\u1ed9t g\u00f3c \ud835\udefc<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Gi\u1eefa sin v\u00e0 tan: V\u1edbi m\u1ecdi g\u00f3c nh\u1ecdn \ud835\udefc (v\u1edbi 0\u2218 &lt; \u03b1&lt; 90\u2218): sin \u03b1 &lt; tan \u03b1. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 gi\u1ea3i th\u00edch qua c\u00f4ng th\u1ee9c tan \ud835\udefc = sin \ud835\udefc\/ cos \ud835\udefc, v\u00ec cos \ud835\udefc lu\u00f4n nh\u1ecf h\u01a1n ho\u1eb7c b\u1eb1ng 1 (v\u1edbi 0\u2218 &lt; \u03b1 &lt; 90\u2218) n\u00ean tan \ud835\udefc s\u1ebd lu\u00f4n l\u1edbn h\u01a1n sin \ud835\udefc.\u00a0\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Gi\u1eefa cos v\u00e0 cot: V\u1edbi m\u1ecdi g\u00f3c nh\u1ecdn \ud835\udefc, cos \ud835\udefc &lt; cot \ud835\udefc. \u0110i\u1ec1u n\u00e0y c\u0169ng \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch t\u01b0\u01a1ng t\u1ef1 nh\u01b0 tr\u00ean khi cot \ud835\udefc = cos \ud835\udefc\/ sin \ud835\udefc v\u00e0 v\u00ec sin \ud835\udefc nh\u1ecf h\u01a1n ho\u1eb7c b\u1eb1ng 1 n\u00ean cot \ud835\udefc s\u1ebd l\u1edbn h\u01a1n cos \ud835\udefc.\u00a0<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">T\u00f3m l\u1ea1i:\u00a0<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">N\u1ebfu \u03b1 &lt; \u03b2 th\u00ec sin\u2061 \u03b1 &lt; sin \u2061\u03b2, tan \u2061\u03b1 &lt; tan\u2061 \u03b2 v\u00e0 cos\u2061 \u03b1 &gt; cos\u2061 \u03b2, cot \u2061\u03b1 &gt; cot\u2061 \u03b2.\u00a0<\/span><\/li>\n<li><span style=\"font-weight: 400;\">V\u1edbi c\u00f9ng m\u1ed9t g\u00f3c nh\u1ecdn \u03b1, ta c\u00f3 sin \u2061\u03b1 &lt; tan \u2061\u03b1 v\u00e0 cos \u2061\u03b1 &lt; cot\u2061 \u03b1.\u00a0<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">L\u1ee3i \u00edch c\u1ee7a c\u00e1ch b\u1ea5m cot, sin, cos tr\u00ean m\u00e1y t\u00ednh <\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Vi\u1ec7c s\u1eed d\u1ee5ng m\u00e1y t\u00ednh c\u1ea7m tay \u0111\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n v\u1ec1 t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch cho h\u1ecdc sinh, sinh vi\u00ean v\u00e0 ng\u01b0\u1eddi l\u00e0m vi\u1ec7c trong c\u00e1c l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n ph\u1ee9c t\u1ea1p li\u00ean quan \u0111\u1ebfn l\u01b0\u1ee3ng gi\u00e1c. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng l\u1ee3i \u00edch c\u1ee5 th\u1ec3:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">M\u00e1y t\u00ednh c\u1ea7m tay gi\u00fap t\u00ednh c\u00e1c t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c nh\u01b0 sin, cos, tan, cot c\u0169ng nh\u01b0 c\u00e1c h\u00e0m s\u1ed1 kh\u00e1c m\u1ed9t c\u00e1ch nhanh ch\u00f3ng, ch\u00ednh x\u00e1c. \u0110i\u1ec1u n\u00e0y tr\u00e1nh sai s\u00f3t khi t\u00ednh to\u00e1n th\u1ee7 c\u00f4ng \u0111\u1eb7c bi\u1ec7t l\u00e0 v\u1edbi c\u00e1c g\u00f3c kh\u00f4ng ph\u1ea3i l\u00e0 c\u00e1c g\u00f3c \u0111\u1eb7c bi\u1ec7t nh\u01b0 30\u00b0, 45\u00b0, 60\u00b0.<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-5.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-5-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-5-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394410 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-5.jpg\" alt=\"cach-bam-cot-tren-may-tinh-5\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-5-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-5-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">V\u1edbi m\u00e1y t\u00ednh c\u1ea7m tay, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 n\u1eafm \u0111\u01b0\u1ee3c c\u00e1ch b\u1ea5m sin, cos, tan, cot&#8230;cho m\u1ecdi g\u00f3c, k\u1ec3 c\u1ea3 nh\u1eefng g\u00f3c c\u00f3 d\u1ea1ng s\u1ed1 th\u1eadp ph\u00e2n ho\u1eb7c s\u1ed1 l\u1edbn m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i tra b\u1ea3ng l\u01b0\u1ee3ng gi\u00e1c. Do \u0111\u00f3, c\u00e1c b\u1ea1n c\u00f3 th\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i to\u00e1n l\u01b0\u1ee3ng gi\u00e1c nhanh h\u01a1n, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c b\u00e0i to\u00e1n c\u00f3 g\u00f3c b\u1ea5t k\u1ef3 ho\u1eb7c s\u1ed1 li\u1ec7u kh\u00f4ng tr\u00f2n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">M\u00e1y t\u00ednh c\u1ea7m tay gi\u00fap ki\u1ec3m tra nhanh c\u00e1c k\u1ebft qu\u1ea3 \u0111\u00e3 t\u00ednh b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p th\u1ee7 c\u00f4ng ho\u1eb7c ki\u1ec3m tra c\u00e1c b\u01b0\u1edbc trung gian trong qu\u00e1 tr\u00ecnh gi\u1ea3i to\u00e1n. S\u1eed d\u1ee5ng m\u00e1y t\u00ednh c\u1ea7m tay gi\u00fap h\u1ecdc sinh t\u1eadp trung v\u00e0o c\u00e1ch gi\u1ea3i b\u00e0i to\u00e1n v\u00e0 hi\u1ec3u b\u1ea3n ch\u1ea5t thay v\u00ec ph\u1ea3i t\u1eadp trung v\u00e0o c\u00e1c ph\u00e9p t\u00ednh tay ph\u1ee9c t\u1ea1p.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trong c\u00e1c k\u1ef3 thi, vi\u1ec7c s\u1eed d\u1ee5ng m\u00e1y t\u00ednh c\u1ea7m tay gi\u00fap ti\u1ebft ki\u1ec7m th\u1eddi gian v\u00e0 t\u1ed1i \u01b0u h\u00f3a k\u1ebft qu\u1ea3 khi gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n c\u00f3 li\u00ean quan \u0111\u1ebfn l\u01b0\u1ee3ng gi\u00e1c.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">C\u00e1ch gi\u1ea3i t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c b\u1eb1ng m\u00e1y t\u00ednh\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 th\u1ea5y c\u00e1ch t\u00ednh t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c tr\u00ean m\u00e1y t\u00ednh c\u1ea7m tay r\u1ea5t ti\u1ec7n l\u1ee3i. Sau \u0111\u00e2y, ch\u00fang t\u00f4i s\u1ebd h\u01b0\u1edbng d\u1eabn c\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh c\u0169ng nh\u01b0 h\u00e0m sin, cos, tan cho c\u00e1c b\u1ea1n n\u1eafm \u0111\u01b0\u1ee3c:\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">C\u00e1ch b\u1ea5m gi\u1ea3i sin<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 t\u00ednh sin tr\u00ean m\u00e1y t\u00ednh c\u1ea7m tay, b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n theo c\u00e1c b\u01b0\u1edbc d\u01b0\u1edbi \u0111\u00e2y, t\u00f9y v\u00e0o vi\u1ec7c t\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a g\u00f3c ho\u1eb7c t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c. Gi\u1ea3 s\u1eed b\u1ea1n mu\u1ed1n t\u00ednh gi\u00e1 tr\u1ecb sin c\u1ee7a m\u1ed9t g\u00f3c 30.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 1: Nh\u1ea5n ph\u00edm SHIFT tr\u00ean m\u00e1y t\u00ednh.\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-6.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-6-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-6-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394411 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-6.jpg\" alt=\"cach-bam-cot-tren-may-tinh-6\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-6-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-6-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 2: Sau \u0111\u00f3 nh\u1ea5n ph\u00edm SIN \u0111\u1ec3 ch\u1ecdn ch\u1ee9c n\u0103ng ngh\u1ecbch \u0111\u1ea3o c\u1ee7a sin (<\/span><span style=\"font-weight: 400;\">sin<\/span><span style=\"font-weight: 400;\">-1<\/span><span style=\"font-weight: 400;\">)<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-7.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-7-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-7-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394412 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-7.jpg\" alt=\"cach-bam-cot-tren-may-tinh-7\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-7.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-7-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-7-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 3: Ti\u1ebfn h\u00e0nh nh\u1eadp gi\u00e1 tr\u1ecb c\u1ee7a sin ch\u1eb3ng h\u1ea1n nh\u01b0 1\/2\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-8.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-8-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-8-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394413 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-8.jpg\" alt=\"cach-bam-cot-tren-may-tinh-8\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-8.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-8-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-8-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 4: Nh\u1ea5n d\u1ea5u ngo\u1eb7c \u0111\u00f3ng ) (n\u1ebfu c\u1ea7n), r\u1ed3i nh\u1ea5n = \u0111\u1ec3 hi\u1ec3n th\u1ecb k\u1ebft qu\u1ea3.\u00a0\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-9.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-9-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-9-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394414 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-9.jpg\" alt=\"cach-bam-cot-tren-may-tinh-9\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-9.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-9-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-9-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-10.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-10-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-10-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394415 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-10.jpg\" alt=\"cach-bam-cot-tren-may-tinh-10\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-10.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-10-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-10-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h3><span style=\"font-weight: 400;\">C\u00e1ch b\u1ea5m gi\u1ea3i cos\u00a0<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 bi\u1ebft c\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh, c\u00e1c b\u1ea1n c\u1ea7n n\u1eafm \u0111\u01b0\u1ee3c c\u00e1ch b\u1ea5m cos. Khi t\u00ednh cos ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c b\u1ea1n mu\u1ed1n t\u00ednh gi\u00e1 tr\u1ecb cos c\u1ee7a m\u1ed9t g\u00f3c hay t\u00ecm g\u00f3c t\u1eeb gi\u00e1 tr\u1ecb cos \u0111\u00e3 bi\u1ebft. V\u00ed d\u1ee5 gi\u00e1 tr\u1ecb c\u1ee7a cos cho m\u1ed9t g\u00f3c c\u1ee5 th\u1ec3 l\u00e0 60\u2218.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 1: Nh\u1ea5n ph\u00edm SHIFT \u0111\u1ec3 chuy\u1ec3n sang ch\u1ee9c n\u0103ng ngh\u1ecbch \u0111\u1ea3o c\u1ee7a cos.\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-11.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-11-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-11-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394416 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-11.jpg\" alt=\"cach-bam-cot-tren-may-tinh-11\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-11.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-11-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-11-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 2: Nh\u1ea5n COS \u0111\u1ec3 ch\u1ecdn ch\u1ee9c n\u0103ng ngh\u1ecbch \u0111\u1ea3o (<\/span><span style=\"font-weight: 400;\">cos<\/span><span style=\"font-weight: 400;\">-1<\/span><span style=\"font-weight: 400;\">)<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-12.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-12-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-12-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394417 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-12.jpg\" alt=\"cach-bam-cot-tren-may-tinh-12\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-12.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-12-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-12-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 3: Nh\u1eadp gi\u00e1 tr\u1ecb c\u1ee7a cos, \u1edf \u0111\u00e2y ch\u00fang t\u00f4i nh\u1eadp 1\/2.<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-13.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-13-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-13-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394418 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-13.jpg\" alt=\"cach-bam-cot-tren-may-tinh-13\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-13.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-13-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-13-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 4: Nh\u1ea5n ph\u00edm ngo\u1eb7c \u0111\u00f3ng ) (n\u1ebfu c\u1ea7n), sau \u0111\u00f3 nh\u1ea5n = \u0111\u1ec3 hi\u1ec3n th\u1ecb k\u1ebft qu\u1ea3.\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-14.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-14-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-14-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394419 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-14.jpg\" alt=\"cach-bam-cot-tren-may-tinh-14\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-14.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-14-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-14-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-15.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-15-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-15-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394420 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-15.jpg\" alt=\"cach-bam-cot-tren-may-tinh-15\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-15.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-15-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-15-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h3><span style=\"font-weight: 400;\">C\u00e1ch b\u1ea5m gi\u1ea3i tan\u00a0<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Kh\u00f4ng ch\u1ec9 bi\u1ebft c\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh, c\u00e1c b\u1ea1n c\u1ea7n bi\u1ebft c\u00e1ch gi\u1ea3i h\u00e0m tan. N\u1ebfu b\u1ea1n mu\u1ed1n t\u00ednh gi\u00e1 tr\u1ecb tan c\u1ee7a m\u1ed9t g\u00f3c c\u1ee5 th\u1ec3 v\u00ed d\u1ee5 tan30\u2218 th\u00ec h\u00e3y th\u1ef1c hi\u1ec7n theo c\u00e1c b\u01b0\u1edbc nh\u01b0 sau:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 1: Nh\u1ea5n ph\u00edm SHIFT \u0111\u1ec3 chuy\u1ec3n sang ch\u1ee9c n\u0103ng ngh\u1ecbch \u0111\u1ea3o c\u1ee7a tan.\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-16.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-16-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-16-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394421 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-16.jpg\" alt=\"cach-bam-cot-tren-may-tinh-16\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-16.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-16-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-16-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 2: Nh\u1ea5n ph\u00edm TAN \u0111\u1ec3 ch\u1ecdn ch\u1ee9c n\u0103ng ngh\u1ecbch \u0111\u1ea3o <\/span><span style=\"font-weight: 400;\">tan<\/span><span style=\"font-weight: 400;\">-1<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-17.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-17-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-17-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394422 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-17.jpg\" alt=\"cach-bam-cot-tren-may-tinh-17\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-17.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-17-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-17-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 3: Nh\u1eadp gi\u00e1 tr\u1ecb v\u00ed d\u1ee5 <\/span><span style=\"font-weight: 400;\">tan<\/span><span style=\"font-weight: 400;\">-1<\/span><span style=\"font-weight: 400;\">(1).<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-18.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-18-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-18-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394423 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-18.jpg\" alt=\"cach-bam-cot-tren-may-tinh-18\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-18.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-18-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-18-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 4: Nh\u1ea5n d\u1ea5u ngo\u1eb7c \u0111\u00f3ng ) (n\u1ebfu m\u00e1y y\u00eau c\u1ea7u), sau \u0111\u00f3 nh\u1ea5n = \u0111\u1ec3 hi\u1ec3n th\u1ecb k\u1ebft qu\u1ea3.\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-19.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-19-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-19-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394424 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-19.jpg\" alt=\"cach-bam-cot-tren-may-tinh-19\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-19.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-19-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-19-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-20.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-20-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-20-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394425 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-20.jpg\" alt=\"cach-bam-cot-tren-may-tinh-20\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-20.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-20-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-20-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h3>C\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh<\/h3>\n<p><span style=\"font-weight: 400;\">V\u1edbi c\u00e1ch b\u1ea5m cot, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng hai ph\u01b0\u01a1ng ph\u00e1p:\u00a0<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">C\u00f4ng th\u1ee9c cot = 1\/tan (d\u00f9ng tan \u0111\u1ec3 t\u00ednh cot).<\/span><\/li>\n<li><span style=\"font-weight: 400;\">C\u00f4ng th\u1ee9c cot A = tan(90\u00b0 &#8211; A) (chuy\u1ec3n \u0111\u1ed5i g\u00f3c).<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng ph\u00e1p 1: S\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c cot = 1\/tan.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 1: Nh\u1ea5n ch\u1ecdn ph\u00edm ph\u00e2n s\u1ed1 (ph\u00edm v\u1edbi bi\u1ec3u t\u01b0\u1ee3ng a\/b\u200b) tr\u00ean m\u00e1y t\u00ednh \u0111\u1ec3 nh\u1eadp ph\u00e9p t\u00ednh ph\u00e2n s\u1ed1.<\/span><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 2: Nh\u1eadp s\u1ed1 1 v\u00e0o ph\u1ea7n t\u1eed s\u1ed1 c\u1ee7a ph\u00e2n s\u1ed1.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-21.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-21-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-21-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394426 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-21.jpg\" alt=\"cach-bam-cot-tren-may-tinh-21\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-21.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-21-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-21-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 3: Nh\u1ea5n ph\u00edm TAN \u0111\u1ec3 nh\u1eadp h\u00e0m s\u1ed1 tan -&gt; nh\u1eadp gi\u00e1 tr\u1ecb c\u1ee7a g\u00f3c m\u00e0 \u0111\u1ec1 b\u00e0i y\u00eau c\u1ea7u.\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-22.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-22-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-22-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394427 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-22.jpg\" alt=\"cach-bam-cot-tren-may-tinh-22\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-22.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-22-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-22-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 4: Nh\u1ea5n ph\u00edm ngo\u1eb7c \u0111\u00f3ng ) (n\u1ebfu m\u00e1y y\u00eau c\u1ea7u), sau \u0111\u00f3 nh\u1ea5n = \u0111\u1ec3 t\u00ednh to\u00e1n gi\u00e1 tr\u1ecb cot.\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-23.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-23-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-23-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394428 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-23.jpg\" alt=\"cach-bam-cot-tren-may-tinh-23\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-23.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-23-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-23-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng ph\u00e1p 2: S\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c cot A = tan (90\u00b0 &#8211; A)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 1: Nh\u1ea5n ph\u00edm TAN \u0111\u1ec3 nh\u1eadp h\u00e0m tan.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 2: Nh\u1eadp gi\u00e1 tr\u1ecb 90\u2218 &#8211; A (v\u00ed d\u1ee5: 90\u2218 \u2212 60\u2218 =30 \u2218)<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-24.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-24-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-24-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394429 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-24.jpg\" alt=\"cach-bam-cot-tren-may-tinh-24\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-24.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-24-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-24-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u01b0\u1edbc 3: Nh\u1ea5n d\u1ea5u ngo\u1eb7c \u0111\u00f3ng ) (n\u1ebfu m\u00e1y y\u00eau c\u1ea7u), sau \u0111\u00f3 nh\u1ea5n =.\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-25.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-25-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-25-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-394430 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-25.jpg\" alt=\"cach-bam-cot-tren-may-tinh-25\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-25.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-25-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2024\/10\/cach-bam-cot-tren-may-tinh-25-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">L\u01b0u \u00fd: N\u1ebfu m\u00e1y t\u00ednh \u0111ang \u1edf ch\u1ebf \u0111\u1ed9 rad (radian) thay v\u00ec deg (degree), b\u1ea1n s\u1ebd c\u1ea7n chuy\u1ec3n v\u1ec1 ch\u1ebf \u0111\u1ed9 \u0111o \u0111\u1ed9. \u0110\u1ec3 l\u00e0m \u0111i\u1ec1u n\u00e0y, h\u00e3y nh\u1ea5n SHIFT + MODE v\u00e0 ch\u1ecdn Deg.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">T\u1ea1m K\u1ebft\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Vi\u1ec7c s\u1eed d\u1ee5ng m\u00e1y t\u00ednh c\u1ea7m tay \u0111\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n v\u1ec1 h\u1ec7 th\u1ee9c l\u01b0\u1ee3ng gi\u00e1c mang l\u1ea1i r\u1ea5t nhi\u1ec1u l\u1ee3i \u00edch gi\u00fap h\u1ecdc sinh gi\u1ea3i quy\u1ebft nhanh ch\u00f3ng v\u00e0 ch\u00ednh x\u00e1c c\u00e1c ph\u00e9p t\u00ednh ph\u1ee9c t\u1ea1p. V\u1edbi c\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh c\u0169ng nh\u01b0 h\u00e0m sin, cos, tan, b\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng t\u00ednh to\u00e1n c\u00e1c gi\u00e1 tr\u1ecb trong b\u00e0i to\u00e1n tam gi\u00e1c vu\u00f4ng. \u0110\u1eb7c bi\u1ec7t, hi\u1ec3u r\u00f5 c\u00e1ch s\u1eed d\u1ee5ng m\u00e1y t\u00ednh c\u1ea7m tay s\u1ebd gi\u00fap h\u1ecdc sinh ti\u1ebft ki\u1ec7m th\u1eddi gian v\u00e0 tr\u00e1nh nh\u1eefng sai s\u00f3t kh\u00f4ng \u0111\u00e1ng c\u00f3 trong qu\u00e1 tr\u00ecnh thi c\u1eed.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, bi\u1ebft c\u00e1ch chuy\u1ec3n \u0111\u1ed5i gi\u1eefa c\u00e1c ch\u1ebf \u0111\u1ed9 \u0111o \u0111\u1ed9 (degree) v\u00e0 radian tr\u00ean m\u00e1y t\u00ednh l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng khi l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c b\u00e0i to\u00e1n li\u00ean quan \u0111\u1ebfn g\u00f3c. Nh\u1edd v\u1eady, b\u1ea1n c\u00f3 th\u1ec3 t\u1ef1 tin h\u01a1n khi \u0111\u1ed1i m\u1eb7t v\u1edbi c\u00e1c b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn l\u01b0\u1ee3ng gi\u00e1c. Tuy nhi\u00ean, b\u1ea1n c\u0169ng c\u1ea7n k\u1ebft h\u1ee3p vi\u1ec7c hi\u1ec3u l\u00fd thuy\u1ebft v\u00e0 l\u00e0m b\u00e0i t\u1eadp th\u1ee7 c\u00f4ng \u0111\u1ec3 n\u1eafm v\u1eefng b\u1ea3n ch\u1ea5t c\u1ee7a c\u00e1c h\u1ec7 th\u1ee9c l\u01b0\u1ee3ng gi\u00e1c, t\u1eeb \u0111\u00f3 \u00e1p d\u1ee5ng linh ho\u1ea1t h\u01a1n khi s\u1eed d\u1ee5ng m\u00e1y t\u00ednh c\u1ea7m tay trong h\u1ecdc t\u1eadp v\u00e0 thi c\u1eed.<\/span><\/p>\n<p><strong>XEM TH\u00caM:\u00a0<\/strong><\/p>\n<ul>\n<li><strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/lap-trinh-may-tinh-la-gi\/\">L\u1eadp tr\u00ecnh l\u00e0 g\u00ec? H\u1ecdc l\u1eadp tr\u00ecnh c\u00f3 kh\u00f3? C\u00e1c lo\u1ea1i ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/loi-mo-file-excel-khong-hien-ra-du-lieu\/\">L\u1ed7i m\u1edf file Excel kh\u00f4ng hi\u1ec7n ra d\u1eef li\u1ec7u v\u00e0 c\u00e1ch kh\u1eafc ph\u1ee5c<\/a><\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Sin, cos, tan, cot l\u00e0 nh\u1eefng t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u00e1c b\u1ea1n s\u1ebd \u0111\u01b0\u1ee3c l\u00e0m quen trong m\u00f4n to\u00e1n l\u1edbp 9. Vi\u1ec7c n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft v\u1ec1 t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c c\u1ee7a g\u00f3c nh\u1ecdn s\u1ebd gi\u00fap c\u00e1c b\u1ea1n h\u1ecdc sinh l\u00e0m t\u1ed1t b\u00e0i t\u1eadp. \u0110\u1ec3 t\u1ed1i \u01b0u ho\u00e1 th\u1eddi gian gi\u1ea3i b\u00e0i t\u1eadp, [&hellip;]<\/p>\n","protected":false},"author":73,"featured_media":394406,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,412],"tags":[],"class_list":["post-394363","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thu-thuat","category-thu-thuat-may-tinh"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.2 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>H\u01b0\u1edbng d\u1eabn t\u00ednh sin, cos, tan, c\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh<\/title>\n<meta name=\"description\" content=\"C\u00e1ch b\u1ea5m cot tr\u00ean m\u00e1y t\u00ednh \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u01b0 th\u1ebf n\u00e0o? 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