{"id":3477,"date":"2025-12-24T17:18:41","date_gmt":"2025-12-24T08:18:41","guid":{"rendered":"https:\/\/math-travel.com\/?p=3477"},"modified":"2026-02-11T16:06:07","modified_gmt":"2026-02-11T07:06:07","slug":"sincostan","status":"publish","type":"post","link":"https:\/\/math-travel.jp\/math-1\/sincostan\/","title":{"rendered":"\u3010\u6570\u5b66\u2160\u3011\u4e09\u89d2\u6bd4\u306e\u91cd\u8981\u5358\u5143\u30fb\u516c\u5f0f\u307e\u3068\u3081\uff01\u5b9a\u671f\u30c6\u30b9\u30c8\u5bfe\u7b56\u306b\u5f79\u7acb\u3064\u91cd\u8981\u30dd\u30a4\u30f3\u30c8"},"content":{"rendered":"\n<p><span class=\"checkmark2 on-color\">\u6570\u5b66\u2160\u56f3\u5f62\u3068\u8a08\u91cf\u3067\u6b20\u304b\u305b\u306a\u3044\u306e\u304c<span class=\"hutoaka\">\u300e\u4e09\u89d2\u6bd4\u300f<\/span>\u3067\u3059\u3088\u306d\u3002<\/span><\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4eca\u56de\u89e3\u6c7a\u3059\u308b\u60a9\u307f<\/span><\/div><div class=\"cap_box_content\">\n<p>\u300c\u4e09\u89d2\u6bd4\u304c\u82e6\u624b\u300d <\/p>\n\n\n\n<p>\u300c\u4e09\u89d2\u6bd4\u306e\u7dcf\u5fa9\u7fd2\u304c\u3057\u305f\u3044\u300d<\/p>\n<\/div><\/div>\n\n\n\n<p>\u4eca\u56de\u306f\u4e09\u89d2\u6bd4\u306b\u95a2\u3059\u308b\u3053\u3093\u306a\u60a9\u307f\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -circle\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2024\/05\/math-travel-hukidashi5-150x150.webp\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u9ad8\u6821\u751f<\/span><\/div><div class=\"c-balloon__body -speaking -border-on\"><div class=\"c-balloon__text\">\n<p>\u4e09\u89d2\u6bd4\u304c\u82e6\u624b\u306a\u3093\u3067\u3059\u2026<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<p><span class=\"yellow-hoso huto\">\u4eca\u56de\u306f\u4e09\u89d2\u6bd4\u306e\u57fa\u790e\u304c\u8a70\u307e\u3063\u305f\u300c\u5b8c\u5168\u653b\u7565\u300d\u8a18\u4e8b\u3092\u66f8\u304d\u307e\u3057\u305f\u3002<\/span><\/p>\n\n\n\n<p>\u9577\u3044\u8a18\u4e8b\u3067\u3059\u304c\u3086\u3063\u304f\u308a\u8aad\u3081\u3070\u4e09\u89d2\u6bd4\u306e\u7dcf\u5fa9\u7fd2\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u89d2\u6bd4\u306e\u91cd\u8981\u516c\u5f0f\u4e00\u89a7<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"500\" height=\"457\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u5b9f\u969b\u306e\u53e3\u30b3\u30df\u9752-e1632365940235.png\" alt=\"\u4e09\u89d2\u6bd4\u306e\u91cd\u8981\u516c\u5f0f\u307e\u3068\u3081\" class=\"wp-image-7257\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u5b9f\u969b\u306e\u53e3\u30b3\u30df\u9752-e1632365940235.png 500w, https:\/\/math-travel.jp\/wp-content\/uploads\/2021\/06\/\u5b9f\u969b\u306e\u53e3\u30b3\u30df\u9752-e1632365940235-300x274.png 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n<\/div>\n\n\n<p><span class=\"huto\">\u307e\u305a\u306f\u300e\u4e09\u89d2\u6bd4\u300f\u306b\u304a\u3044\u3066\u78ba\u5b9f\u306b\u62bc\u3055\u3048\u305f\u3044<br class=\"br-sp\"><span class=\"hutoaka\">\u91cd\u8981\u306a\u516c\u5f0f5\u3064<\/span>\u3092\u30ea\u30b9\u30c8\u30a2\u30c3\u30d7\u3057\u307e\u3057\u305f\u3002<\/span><\/p>\n\n\n\n<p><span class=\"checkmark2 on-color\">\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f\u3092\u5927\u6025\u304e\u3067\u77e5\u308a\u305f\u3044\u65b9\u306f\u3053\u3061\u3089\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/span><\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f<\/span><\/div><div class=\"cap_box_content\">\n<ol class=\"wp-block-list\">\n<li><a href=\"#koushiki1\">\u4e09\u89d2\u6bd4\u306e\u57fa\u672c\u516c\u5f0f<\/a><\/li>\n\n\n\n<li><a href=\"#koushiki2\">\u4e09\u89d2\u6bd4\u306e\u76f8\u4e92\u95a2\u4fc2<\/a><\/li>\n\n\n\n<li><a href=\"#koushiki3\">\u6b63\u5f26\u5b9a\u7406<\/a><\/li>\n\n\n\n<li><a href=\"#koushiki4\">\u4f59\u5f26\u5b9a\u7406<\/a><\/li>\n\n\n\n<li><a href=\"#koushiki5\">\\(\\sin\\)\u3092\u7528\u3044\u305f\u4e09\u89d2\u5f62\u306e\u9762\u7a4d<\/a><\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"koushiki1\">\u4e09\u89d2\u6bd4\u306e\u57fa\u672c\u516c\u5f0f<\/h3>\n\n\n\n<p>\u4e09\u89d2\u6bd4(\\(\\sin,\\cos,\\tan\\)\uff09\u306e\u57fa\u672c\u516c\u5f0f\u3067\u3001\u4e09\u89d2\u6bd4\u3092\u5b66\u3093\u3067\u3044\u304f\u4e0a\u3067\u306f\u6b20\u304b\u305b\u306a\u3044\u516c\u5f0f\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list\">\n<li>\\(\\sin \\theta =\\displaystyle \\frac{y}{r}\\)<\/li>\n\n\n\n<li>\\(\\cos \\theta =\\displaystyle \\frac{x}{r}\\)<\/li>\n\n\n\n<li>\\(\\tan \\theta =\\displaystyle \\frac{y}{x}\\)<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p><a href=\"#hi\">\uff1e\u3082\u3046\u5c11\u3057\u8a73\u3057\u304f<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"koushiki2\">\u4e09\u89d2\u6bd4\u306e\u76f8\u4e92\u95a2\u4fc2<\/h3>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u306f\\(\\sin,\\cos,\\tan\\)\u306e\u3044\u305a\u308c\u304b\u306e\u5024\u304c\u5206\u304b\u3063\u3066\u3044\u308c\u3070\u4ee5\u4e0b\u306e\u76f8\u4e92\u95a2\u4fc2\u304b\u3089\u4ed6\u306e2\u3064\u306e\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e09\u89d2\u6bd4\u306e\u76f8\u4e92\u95a2\u4fc2<\/span><\/div><div class=\"cap_box_content\">\n<p>\\(\\sin^{2} \\theta+\\cos^{2} \\theta=1\\)<\/p>\n\n\n\n<p>\\(\\displaystyle \\tan \\theta=\\frac{\\sin \\theta}{\\cos \\theta}\\)<\/p>\n\n\n\n<p>\\(\\displaystyle 1+\\tan ^{2} \\theta=\\frac{1}{\\cos ^{2} \\theta}\\)<\/p>\n<\/div><\/div>\n\n\n\n<p><a href=\"#kankei\">\uff1e\u3082\u3046\u5c11\u3057\u8a73\u3057\u304f<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"koushiki3\">\u6b63\u5f26\u5b9a\u7406<\/h3>\n\n\n\n<p>\u6b63\u5f26\u5b9a\u7406\u306f\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092\u6c42\u3081\u308b\u516c\u5f0f\u3067\u3042\u308a\u306a\u304c\u3089\u3001\u5404\u8fba\u306e\u9577\u3055\u3084\u89d2\u306e\u5927\u304d\u3055\u3092\u6c42\u3081\u308b\u3068\u304d\u306b\u3082\u6d3b\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u6b63\u5f26\u5b9a\u7406<\/span><\/div><div class=\"cap_box_content\">\n<p>\u25b3ABC\u306e\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092R\u3068\u3059\u308b\u3068\u3001\u6b21\u304c\u6210\u308a\u7acb\u3064\u3002<\/p>\n\n\n\n<p>\\[\\displaystyle \\frac{a}{\\sin A}=\\frac{b}{\\sin B}=\\frac{c}{\\sin C}=2R\\]<\/p>\n<\/div><\/div>\n\n\n\n<p><a href=\"#seigen\">\uff1e\u3082\u3046\u5c11\u3057\u8a73\u3057\u304f<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"koushiki4\">\u4f59\u5f26\u5b9a\u7406<\/h3>\n\n\n\n<p>\u4f59\u5f26\u5b9a\u7406\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u5404\u8fba\u306e\u9577\u3055\u3084\u89d2\u306e\u5927\u304d\u3055\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4f59\u5f26\u5b9a\u7406<\/span><\/div><div class=\"cap_box_content\">\n<p>\u25b3ABC\u306b\u304a\u3044\u3066\u3001\u6b21\u304c\u6210\u308a\u7acb\u3064\u3002<\/p>\n\n\n\n<p>\\(a^{2}=b^{2}+c^{2}-2bc \\cos \\angle A\\)<\/p>\n\n\n\n<p>\\(b^{2}=a^{2}+c^{2}-2ac \\cos \\angle B\\)<\/p>\n\n\n\n<p>\\(c^{2}=a^{2}+b^{2}-2ab \\cos \\angle C\\)<\/p>\n<\/div><\/div>\n\n\n\n<p><a href=\"#yogen\">\uff1e\u3082\u3046\u5c11\u3057\u8a73\u3057\u304f<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"koushiki5\">\\(\\sin\\)\u3092\u7528\u3044\u305f\u4e09\u89d2\u5f62\u306e\u9762\u7a4d<\/h3>\n\n\n\n<p>2\u3064\u306e\u8fba\u306e\u9577\u3055\u3068\u305d\u306e\u9593\u306e\u89d2\u306e\u5927\u304d\u3055\u304c\u5206\u304b\u3063\u3066\u3044\u308b\u3068\u304d\u3001\u4ee5\u4e0b\u306e\u516c\u5f0f\u3092\u7528\u3044\u3066\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><a href=\"#sin\">\uff1e\u3082\u3046\u5c11\u3057\u8a73\u3057\u304f<\/a><\/p>\n\n\n\n<p><span class=\"huto\">\u4e0a\u3067\u7d39\u4ecb\u3057\u305f\u516c\u5f0f\u306f\u3069\u308c\u3082\u4e09\u89d2\u6bd4\u306b\u6b20\u304b\u305b\u306a\u3044\u91cd\u8981\u306a\u516c\u5f0f\u3067\u3059\u3002<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"hi\">\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f<\/h2>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u306f\\(\\sin\\)\uff08\u30b5\u30a4\u30f3\uff09\u3084\\(\\cos\\)\uff08\u30b3\u30b5\u30a4\u30f3\uff09\u3068\u3044\u3046\u8a18\u53f7\u3092\u4f7f\u3063\u3066\u8868\u73fe\u3057\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/1-3.jpg\" alt=\"&quot;\u4e09\u89d2\u6bd4\u306e\u5b9a\u7fa9<\/h3\"\/><\/figure>\n<\/div>\n\n\n<p><span class=\"huto\">\u4ee5\u4e0b\u306e\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f\u306f\u899a\u3048\u3066\u304a\u304b\u306a\u3044\u3068\u3001\u624b\u3082\u8db3\u3082\u51fa\u306a\u3044\u306e\u3067\u5fc5\u305a\u899a\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/span><\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list\">\n<li>\\(\\sin \\theta =\\displaystyle \\frac{y}{r}\\)<\/li>\n\n\n\n<li>\\(\\cos \\theta =\\displaystyle \\frac{x}{r}\\)<\/li>\n\n\n\n<li>\\(\\tan \\theta =\\displaystyle \\frac{y}{x}\\)<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f\u3092\u4f7f\u3044\u3053\u306a\u305b\u308b\u3088\u3046\u306b\u5b9f\u969b\u306b\u6570\u5b57\u3092\u4ee3\u5165\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"673\" height=\"302\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/6-1.jpg\" alt=\"\u4e09\u89d2\u6bd4\" class=\"wp-image-2040\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/6-1.jpg 673w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/6-1-300x135.jpg 300w\" sizes=\"(max-width: 673px) 100vw, 673px\" \/><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"655\" height=\"292\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/5-2.jpg\" alt=\"\u4e09\u89d2\u6bd4\" class=\"wp-image-2039\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/5-2.jpg 655w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/5-2-300x134.jpg 300w\" sizes=\"(max-width: 655px) 100vw, 655px\" \/><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"625\" height=\"301\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/7-1.jpg\" alt=\"\u4e09\u89d2\u6bd4\" class=\"wp-image-2041\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/7-1.jpg 625w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/7-1-300x144.jpg 300w\" sizes=\"(max-width: 625px) 100vw, 625px\" \/><\/figure>\n<\/div>\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001<span class=\"yellow-hoso\">\u659c\u8fba\u306e\u9577\u3055\u3001\\(x\\)\u5ea7\u6a19\u3001\\(y\\)\u5ea7\u6a19\u304c\u5206\u304b\u3063\u3066\u3044\u308c\u3070\u4e09\u89d2\u6bd4\u3092\u8868\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p>\u307e\u305f\u3001\\(90^\\circ\\)\u3092\u8d85\u3048\u308b\u5834\u5408\u3082\u3001\u4e09\u89d2\u5f62\u3092\u30a4\u30e1\u30fc\u30b8\u3059\u308b\u3053\u3068\u3067\u4e09\u89d2\u6bd4\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"671\" height=\"326\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/8-1.jpg\" alt=\"\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f\" class=\"wp-image-2042\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/8-1.jpg 671w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/8-1-300x146.jpg 300w\" sizes=\"(max-width: 671px) 100vw, 671px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"kankei\">\u4e09\u89d2\u6bd4\u306e\u76f8\u4e92\u95a2\u4fc2<\/h2>\n\n\n\n<p><span class=\"huto\">\u4e09\u89d2\u6bd4\u306e\u76f8\u4e92\u95a2\u4fc2\u306f\u91cd\u8981\u306a\u516c\u5f0f\u3067\u3059\u3002<\/span><\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4e09\u89d2\u6bd4\u306e\u76f8\u4e92\u95a2\u4fc2<\/span><\/div><div class=\"cap_box_content\">\n<p>\\(\\sin^{2} \\theta+\\cos^{2} \\theta=1\\)<\/p>\n\n\n\n<p>\\(\\displaystyle \\tan \\theta=\\frac{\\sin \\theta}{\\cos \\theta}\\)<\/p>\n\n\n\n<p>\\(\\displaystyle 1+\\tan ^{2} \\theta=\\frac{1}{\\cos ^{2} \\theta}\\)<\/p>\n<\/div><\/div>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u306e\u76f8\u4e92\u95a2\u4fc2\u3092\u7528\u3044\u308c\u3070\u3001<span class=\"yellow-hoso\">sin,cos,tan\u306e\u3069\u308c\u304b1\u3064\u304c\u5206\u304b\u308c\u3070\u3001\u4ed6\u306e\u3059\u3079\u3066\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p><span class=\"checkmark2 on-color\">\u4e09\u89d2\u6bd4\u306e\u76f8\u4e92\u95a2\u4fc2\u306f\u5fc5\u305a\u899a\u3048\u3088\u3046\uff01<br><\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"kakutyou\">\u4e09\u89d2\u6bd4\u306e\u62e1\u5f35<\/h2>\n\n\n\n<p>\\(\\sin(\\theta+\\pi)\\)\u306a\u3069\u4e09\u89d2\u6bd4\u306e\u62e1\u5f35\u516c\u5f0f\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\\(-\\theta\\)\u306e\u516c\u5f0f<\/h3>\n\n\n\n<p>\\(-\\theta\\)\u306e\u516c\u5f0f\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"670\" height=\"425\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/1-6.jpg\" alt=\"\u4e09\u89d2\u6bd4\u306e\u62e1\u5f35\" class=\"wp-image-2128\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/1-6.jpg 670w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/1-6-300x190.jpg 300w\" sizes=\"(max-width: 670px) 100vw, 670px\" \/><\/figure>\n<\/div>\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u30dd\u30a4\u30f3\u30c8<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list\">\n<li>\\(\\sin (-\\theta)=-\\sin \\theta\\)<\/li>\n\n\n\n<li>\\(\\cos (-\\theta)=\\cos \\theta\\)<\/li>\n\n\n\n<li>\\(\\tan (-\\theta)=-\\tan \\theta\\)<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\\(\\displaystyle \\theta+\\frac{\\pi}{2}\\)\u306e\u516c\u5f0f<\/h3>\n\n\n\n<p>\\(\\theta\\)\u306b\u5bfe\u3057\u3066\\(\\displaystyle \\frac{\\pi}{2}=90\u00b0\\)\u3092\u52a0\u3048\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"667\" height=\"428\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/2-5.jpg\" alt=\"\u4e09\u89d2\u6bd4\u306e\u62e1\u5f35\" class=\"wp-image-2129\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/2-5.jpg 667w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/2-5-300x193.jpg 300w\" sizes=\"(max-width: 667px) 100vw, 667px\" \/><\/figure>\n<\/div>\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u30dd\u30a4\u30f3\u30c8<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list\">\n<li>\\(\\displaystyle \\sin (\\theta+\\frac{\\pi}{2})=\\cos \\theta\\)<\/li>\n\n\n\n<li>\\(\\displaystyle \\cos (\\theta+\\frac{\\pi}{2})=-\\sin \\theta \\)<\/li>\n\n\n\n<li>\\(\\displaystyle \\tan (\\theta+\\frac{\\pi}{2})=-\\frac{1}{\\tan \\theta}\\)<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\\(\\theta+\\pi\\)\u306e\u516c\u5f0f<\/h3>\n\n\n\n<p>\\(\\theta\\)\u306b\u5bfe\u3057\u3066\\(\\pi=180\u00b0\\)\u3092\u52a0\u3048\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"619\" height=\"431\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/3-4.jpg\" alt=\"\u4e09\u89d2\u6bd4\u306e\u62e1\u5f35\" class=\"wp-image-2130\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/3-4.jpg 619w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/3-4-300x209.jpg 300w\" sizes=\"(max-width: 619px) 100vw, 619px\" \/><\/figure>\n<\/div>\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u30dd\u30a4\u30f3\u30c8<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list\">\n<li>\\(\\sin (\\theta+\\pi)=-\\sin \\theta \\)<\/li>\n\n\n\n<li>\\(\\cos (\\theta+\\pi)=-\\cos \\theta \\)<\/li>\n\n\n\n<li>\\(\\tan (\\theta+\\pi)=\\tan \\theta\\)<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"seigen\">\u6b63\u5f26\u5b9a\u7406<\/h2>\n\n\n\n<p><span class=\"huto\">\u6b63\u5f26\u5b9a\u7406\u306f\u4e09\u89d2\u5f62\u306b\u4f7f\u3046\u5b9a\u7406\u3067\u3059\u3002<\/span><\/p>\n\n\n\n<p>\u5404\u9802\u70b9A,B,C\u3068\u3057\u3066\u3001\u5411\u304b\u3044\u5408\u3046\u8fba\u3092a,b,c\u3068\u3059\u308b\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"544\" height=\"411\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/1-9.jpg\" alt=\"\u6b63\u5f26\u5b9a\u7406\" class=\"wp-image-2302\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/1-9.jpg 544w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/1-9-300x227.jpg 300w\" sizes=\"(max-width: 544px) 100vw, 544px\" \/><\/figure>\n<\/div>\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u6b63\u5f26\u5b9a\u7406<\/span><\/div><div class=\"cap_box_content\">\n<p>\u25b3ABC\u306e\u5916\u63a5\u5186\u306e\u534a\u5f84\u3092R\u3068\u3059\u308b\u3068\u3001\u6b21\u304c\u6210\u308a\u7acb\u3064\u3002<\/p>\n\n\n\n<p>\\[\\displaystyle \\frac{a}{\\sin A}=\\frac{b}{\\sin B}=\\frac{c}{\\sin C}=2R\\]<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"yogen\">\u4f59\u5f26\u5b9a\u7406<\/h2>\n\n\n\n<p><span class=\"huto\">\u4f59\u5f26\u5b9a\u7406\u3082\u4e09\u89d2\u5f62\u306b\u8fba\u3084\u89d2\u3092\u6c42\u3081\u308b\u5b9a\u7406\u3067\u3059\u3002<\/span><\/p>\n\n\n\n<p>\u5404\u9802\u70b9A,B,C\u3068\u3057\u3066\u3001\u5411\u304b\u3044\u5408\u3046\u8fba\u3092a,b,c\u3068\u3059\u308b\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" width=\"392\" height=\"279\" src=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/2-9.jpg\" alt=\"\u4f59\u5f26\u5b9a\u7406\" class=\"wp-image-2440\" srcset=\"https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/2-9.jpg 392w, https:\/\/math-travel.jp\/wp-content\/uploads\/2020\/05\/2-9-300x214.jpg 300w\" sizes=\"(max-width: 392px) 100vw, 392px\" \/><\/figure>\n<\/div>\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u4f59\u5f26\u5b9a\u7406<\/span><\/div><div class=\"cap_box_content\">\n<p>\u25b3ABC\u306b\u304a\u3044\u3066\u3001\u6b21\u304c\u6210\u308a\u7acb\u3064\u3002<\/p>\n\n\n\n<p>\\(a^{2}=b^{2}+c^{2}-2bc \\cos \\angle A\\)<\/p>\n\n\n\n<p>\\(b^{2}=a^{2}+c^{2}-2ac \\cos \\angle B\\)<\/p>\n\n\n\n<p>\\(c^{2}=a^{2}+b^{2}-2ab \\cos \\angle C\\)<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"sin\">sin\u3092\u4f7f\u3063\u305f\u9762\u7a4d\u516c\u5f0f<\/h2>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u3092\u4f7f\u3063\u3066<span class=\"yellow-hoso\">\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u3092\u6c42\u3081\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3093\u3067\u3059\u3002<\/span><\/p>\n\n\n\n<p>sin\uff08\u30b5\u30a4\u30f3\uff09\u3092\u7528\u3044\u305f\u9762\u7a4d\u516c\u5f0f\u306f\u4e09\u89d2\u5f62\u306e2\u8fba\u3068\u305d\u306e\u9593\u306e\u89d2\u304c\u5206\u304b\u3063\u3066\u308b\u3068\u304d\u306b\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>sin\uff08\u30b5\u30a4\u30f3\uff09\u3092\u7528\u3044\u308b\u4e09\u89d2\u5f62\u306e\u9762\u7a4d\u516c\u5f0f\u3092\u89e3\u8aac\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"matome\">\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f\u3000\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u4e09\u89d2\u6bd4\u306b\u3064\u3044\u3066\u306e\u5b8c\u5168\u653b\u7565\u8a18\u4e8b\u3068\u3057\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u306b\u95a2\u3059\u308b\u8a18\u4e8b\u3092\u7db2\u7f85\u7684\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u304c\u3001\u8a73\u3057\u3044\u30dd\u30a4\u30f3\u30c8\u306f\u5404\u5358\u5143\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3061\u3089\u3082\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<div class=\"wp-block-group is-style-bg_stripe\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<ul class=\"wp-block-list\">\n<li><a href=\"#hi\">\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f<\/a><\/li>\n\n\n\n<li><a href=\"#kankei\">\u4e09\u89d2\u6bd4\u306e\u76f8\u4e92\u95a2\u4fc2<\/a><\/li>\n\n\n\n<li><a href=\"#kakutyou\">\u4e09\u89d2\u6bd4\u306e\u62e1\u5f35<\/a><\/li>\n\n\n\n<li><a href=\"#seigen\">\u6b63\u5f26\u5b9a\u7406<\/a><\/li>\n\n\n\n<li><a href=\"#yogen\">\u4f59\u5f26\u5b9a\u7406<\/a><\/li>\n\n\n\n<li><a href=\"#sin\">sin\u3092\u7528\u3044\u305f\u4e09\u89d2\u5f62\u306e\u9762\u7a4d<\/a><\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>\u6559\u79d1\u66f8\u306b\u5185\u5bb9\u306b\u6cbf\u3063\u305f\u89e3\u8aac\u8a18\u4e8b\u3092\u6319\u3052\u3066\u3044\u308b\u306e\u3067\u3001\u5b9a\u671f\u8a66\u9a13\u524d\u306b\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>\u305d\u308c\u3067\u306f\u6700\u5f8c\u307e\u3067\u3054\u89a7\u3044\u305f\u3060\u304d\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u307f\u3093\u306a\u306e\u52aa\u529b\u304c\u5831\u308f\u308c\u307e\u3059\u3088\u3046\u306b\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6570\u5b66\u2160\u56f3\u5f62\u3068\u8a08\u91cf\u3067\u6b20\u304b\u305b\u306a\u3044\u306e\u304c\u300e\u4e09\u89d2\u6bd4\u300f\u3067\u3059\u3088\u306d\u3002 \u4eca\u56de\u306f\u4e09\u89d2\u6bd4\u306b\u95a2\u3059\u308b\u3053\u3093\u306a\u60a9\u307f\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002 \u4eca\u56de\u306f\u4e09\u89d2\u6bd4\u306e\u57fa\u790e\u304c\u8a70\u307e\u3063\u305f\u300c\u5b8c\u5168\u653b\u7565\u300d\u8a18\u4e8b\u3092\u66f8\u304d\u307e\u3057\u305f\u3002 \u9577\u3044\u8a18\u4e8b\u3067\u3059\u304c\u3086\u3063\u304f\u308a\u8aad\u3081\u3070\u4e09\u89d2\u6bd4\u306e\u7dcf\u5fa9\u7fd2\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5674,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[34,222],"tags":[36,46,10,11],"class_list":["post-3477","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sankakuhi","category-math-1","tag-36","tag-46","tag-a","tag-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u3010\u6570\u5b66\u2160\u3011\u4e09\u89d2\u6bd4\u306e\u91cd\u8981\u5358\u5143\u30fb\u516c\u5f0f\u307e\u3068\u3081\uff01\u5b9a\u671f\u30c6\u30b9\u30c8\u5bfe\u7b56\u306b\u5f79\u7acb\u3064\u91cd\u8981\u30dd\u30a4\u30f3\u30c8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/math-travel.jp\/math-1\/sincostan\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010\u6570\u5b66\u2160\u3011\u4e09\u89d2\u6bd4\u306e\u91cd\u8981\u5358\u5143\u30fb\u516c\u5f0f\u307e\u3068\u3081\uff01\u5b9a\u671f\u30c6\u30b9\u30c8\u5bfe\u7b56\u306b\u5f79\u7acb\u3064\u91cd\u8981\u30dd\u30a4\u30f3\u30c8\" \/>\n<meta property=\"og:description\" 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