{"id":2000,"date":"2025-12-24T17:18:41","date_gmt":"2025-12-24T08:18:41","guid":{"rendered":"https:\/\/math-travel.com\/?p=2000"},"modified":"2026-03-06T02:34:41","modified_gmt":"2026-03-05T17:34:41","slug":"triangle-function","status":"publish","type":"post","link":"https:\/\/math-travel.jp\/math-1\/triangle-function\/","title":{"rendered":"\u4e09\u89d2\u6bd4(sin,cos,tan)\u306e\u516c\u5f0f\u3068\u899a\u3048\u65b9\uff0130\u00b0\u30fb45\u00b0\u30fb60\u00b0\u306e\u5024\u4e00\u89a7\u3082\u7d39\u4ecb"},"content":{"rendered":"\n<p><span class=\"hutoaka\">\u4e09\u89d2\u95a2\u6570\u306b\u82e6\u624b\u610f\u8b58\u304c\u3042\u308b\u9ad8\u6821\u751f\u306f\u5fc5\u898b\uff01<\/span><\/p>\n\n\n\n<p>\\(\\sin,\\cos,\\tan\\)\u306e\u5024\u3092\u6697\u8a18\u3059\u308b\u306e\u306f\u52b9\u7387\u304c\u60aa\u3059\u304e\u307e\u3059\uff01<\/p>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u306e\u5024\u3092\u6697\u8a18\u3057\u3066\u3044\u308b\u3068<\/p>\n\n\n\n<p><span class=\"huto\">\u300c\\(\\displaystyle \\sin 60\u00b0\\)\u3063\u3066\u3044\u304f\u3064\u3060\u3063\u3051&#8230;\u5fd8\u308c\u3057\u3066\u3057\u307e\u3063\u305f&#8230;\u300d<\/span><\/p>\n\n\n\n<p><span class=\"hutoaka\">\u30c6\u30b9\u30c8\u3067\u3053\u3093\u306a\u3053\u3068\u306b\u306a\u308b\u306e\u3067\u5371\u967a\u3067\u3059\uff01<\/span><\/p>\n\n\n\n<p>\u4e0b\u306e\u8868\u306f\u4e09\u89d2\u6bd4\u306e\u4e00\u89a7\u8868\u3067\u3059\u304c\u3001\u3053\u308c\u3092\u4e38\u6697\u8a18\u3057\u3066\u3082\u5fdc\u7528\u529b\u304c\u8eab\u306b\u4ed8\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u306f\u5404\u5024\u3092\u6697\u8a18\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001<span class=\"yellow-hoso\">\u5404\u5024\u306e\u6c42\u3081\u65b9\u3092\u77e5\u3063\u3066\u304a\u304f\u3053\u3068\u304c\u5927\u5207<\/span>\u3067\u3059\u3002<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p>\u672c\u8a18\u4e8b\u306f<span class=\"hutoaka\">\u4e09\u89d2\u6bd4\u306e\u6c42\u3081\u65b9\u3068\u899a\u3048\u65b9\u3092\u89e3\u8aac<\/span>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u4ed6\u306e\u4e09\u89d2\u95a2\u6570\u306e\u516c\u5f0f\u306b\u3064\u3044\u3066\u306f\u300c\u4e09\u89d2\u95a2\u6570\u304c\u5206\u304b\u308b\uff01\u91cd\u8981\u516c\u5f0f\u306e\u4f7f\u3044\u65b9\u3092\u4e01\u5be7\u306b\u89e3\u8aac\uff01\u300d\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"koushiki\">\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f<\/h2>\n\n\n\n<p>\u307e\u305a\u539f\u70b9\\(O\\)\u3092\u4e2d\u5fc3\u3068\u3059\u308b\u534a\u5f84\\(r\\)\u306e\u5186\u3092\u63cf\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\(x\\)\u8ef8\u306e\u6b63\u306e\u65b9\u5411\u306b\u5bfe\u3057\u3066\u3001\u7dda\u5206\\(OA\\)\u306b\u3088\u308b\u89d2\u306e\u5927\u304d\u3055\u3092\\(\\angle AOB=\\theta \\)\u3068\u3059\u308b\u3068\u304d\u3001<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p>\u3053\u306e\u76f4\u89d2\u4e09\u89d2\u5f62\u306b\u304a\u3044\u3066<span class=\"yellow-hoso\">\u5404\u8fba\u306e\u6bd4\u3092\u8868\u3057\u305f\u3082\u306e<\/span>\u304c<span class=\"hutoaka\">\u4e09\u89d2\u6bd4<\/span>\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<p>\\begin{eqnarray}<br>\\sin \\theta &amp;=&amp;\\displaystyle \\frac{y}{r}\\\\<br>\\cos \\theta &amp;=&amp;\\displaystyle \\frac{x}{r}\\\\<br>\\tan \\theta &amp;=&amp;\\displaystyle \\frac{y}{x}<br>\\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p>\u307e\u3060\u30d4\u30f3\u3068\u6765\u3066\u3044\u306a\u3044\u4eba\u306e\u305f\u3081\u306b\u3001\u5b9f\u969b\u306b\u6570\u5b57\u3092\u5165\u308c\u3066\u307f\u307e\u3057\u3087\u3046!<\/p>\n\n\n\n<p>\u4e09\u89d2\u95a2\u6570\u3067\u306f\u4e2d\u5fc3\u89d2\u3092\\(360^\\circ\\)\u3067\u306f\u306a\u304f\u3001\\(2\\pi\\)\u3068\u8868\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e3\u3064\u306f\u4e09\u89d2\u6bd4\u306e\u4ee3\u8868\u7684\u306a\u4e09\u89d2\u5f62\u3067\u3059\u3002<\/p>\n\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\n<h2 class=\"wp-block-heading\" id=\"oboekata\">\u4e09\u89d2\u6bd4(sin,cos,tan)\u306e\u899a\u3048\u65b9<\/h2>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p><span class=\"huto\">\u4e09\u89d2\u6bd4\u306e\u8868\u306f\u6697\u8a18\u3057\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002<\/span><\/p>\n\n\n\n<p>\u305d\u308c\u306f<span class=\"hutoaka\">\u52b9\u7387\u304c\u60aa\u3059\u304e\u308b\u3046\u3048\u306b\u30c6\u30b9\u30c8\u3067\u7d76\u5bfe\u306b\u5fd8\u308c\u307e\u3059<\/span>\u3002<\/p>\n\n\n\n<p>\u306a\u306e\u3067\u3001\u8868\u3092\u899a\u3048\u308b\u306e\u3067\u306f\u306a\u304f\u3066\u6c42\u3081\u65b9\u3092\u899a\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p><span class=\"huto\">sin,cos,tan\u306e\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u306e\u982d\u6587\u5b57\u306b\u6ce8\u76ee\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p>\\(\\sin\\)\u3092\u6c42\u3081\u308b\u3068\u304d\u306f\u3001S\u3092\u63cf\u304f\u3088\u3046\u306b\u6570\u5b57\u3092\u4ee3\u5165\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\\(\\cos\\)\u306f\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u306d\u3002\\(\\theta\\)\u3092\u631f\u3080\u3088\u3046\u306b\u5404\u8fba\u306e\u5024\u3092\u4ee3\u5165\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\\(\\tan\\)\u306f\u7121\u7406\u3084\u308a\u611f\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u306e\u9806\u3067\u4ee3\u5165\u3059\u308b\u3053\u3068\u3067\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><span class=\"hutoaka\">\u30c6\u30b9\u30c8\u3067\u5fd8\u308c\u308b\u306e\u3067\u4e09\u89d2\u6bd4\u306e\u8868\u3092\u6697\u8a18\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u6c42\u3081\u65b9\u3092\u899a\u3048\u307e\u3057\u3087\u3046\u3002<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"sankaku\">\u4e09\u89d2\u6bd4\u304c\u8868\u3059\u3082\u306e<\/h2>\n\n\n\n<p><span class=\"huto\">\u300c\u305d\u3082\u305d\u3082\u4e09\u89d2\u6bd4\u3063\u3066\u306a\u306b\uff01\u300d<\/span><\/p>\n\n\n\n<p>\u305d\u3093\u306a\u58f0\u304c\u805e\u3053\u3048\u3066\u304d\u305d\u3046\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p><span class=\"yellow-hoso\">&#8220;\u4e09\u89d2\u6bd4&#8221;\u3068\u306f\u300c\u4e09\u89d2\u5f62\u306e\u5404\u8fba\u306e\u6bd4\u300d\u3092\u8868\u3057\u3066\u3044\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p>\u305d\u3046\u8a00\u3063\u3066\u3082\u96e3\u3057\u3044\u306e\u3067\u56f3\u3067\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u4e0b\u306e\u56f3\u306e\u3088\u3046\u306a\u4e09\u89d2\u5f62\u304c\u3042\u3063\u305f\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u4e09\u89d2\u5f62\u306e\u4e09\u89d2\u95a2\u6570\u304c\\(\\sin \\theta=\\displaystyle \\frac{5}{13}\\)\u3001\\(\\cos \\theta=\\displaystyle \\frac{12}{13}\\)\u3068\u5206\u304b\u3063\u3066\u3044\u308b\u306a\u3089\u3070<\/p>\n\n\n\n<p><span class=\"huto\">\u659c\u8fba\u306e\u9577\u305513\u306bsin\u3092\u639b\u3051\u308b\\(y\\)\u306e\u9577\u3055\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\ny&amp;=&amp;13\\times \\sin \\theta\\\\<br>\n\\displaystyle &amp;=&amp;13 \\times \\frac{5}{13}\\\\<br>\n&amp;=&amp;5<br>\n\\end{eqnarray}<\/p>\n\n\n\n<p><span class=\"huto\">\u307e\u305f\u3001\u659c\u8fba\u306e\u9577\u305513\u306bcos\u3092\u639b\u3051\u308b\u3068\\(x\\)\u306e\u9577\u3055\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\nx&amp;=&amp;13\\times \\cos \\theta\\\\<br>\n\\displaystyle &amp;=&amp;13 \\times \\frac{12}{13}\\\\<br>\n&amp;=&amp;12<br>\n\\end{eqnarray}<\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\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<p>\u659c\u8fba\u306e\u9577\u305513\u306bsin\u3092\u639b\u3051\u308b\u3068\u7e26\u306e\u8fba\u306e\u9577\u3055\u304c\u5206\u304b\u308a\u307e\u3059\u3002<br>\u659c\u8fba\u00d7\\(\\sin\\)\uff1d\u7e26\u306e\u8fba<br>\u307e\u305f\u3001\u659c\u8fba\u306e\u8fba\u306e\u9577\u305513\u306bcos\u3092\u639b\u3051\u308b\u3068\u6a2a\u306e\u9577\u3055\u304c\u5206\u304b\u308a\u307e\u3059\u3002<br>\u659c\u8fba\u00d7\\(\\cos\\)\uff1d\u6a2a\u306e\u8fba<\/p>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u5404\u8fba\u306e\u9577\u3055\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-bg_stripe\">\u659c\u8fba\u306e\u9577\u3055 \u00d7 \\(\\sin\\) \u21d2\u7e26\u306e\u8fba\u306e\u9577\u3055<br>\u659c\u8fba\u306e\u9577\u3055 \u00d7 \\(\\cos\\) \u21d2\u6a2a\u306e\u8fba\u306e\u9577\u3055<br>\u6a2a\u306e\u8fba\u306e\u9577\u3055 \u00d7 \\(\\tan\\) \u21d2\u7e26\u306e\u9577\u3055<\/p>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u306e\u307e\u3068\u3081\u8a18\u4e8b\u3082\u305c\u3072\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<br> \u21d2\u4e09\u89d2\u95a2\u6570\u304c\u5206\u304b\u308b\uff01\u91cd\u8981\u516c\u5f0f\u306e\u4f7f\u3044\u65b9\u3092\u4e01\u5be7\u306b\u89e3\u8aac\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"mondai\">\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f\uff1c\u7df4\u7fd2\u554f\u984c\uff1e<\/h2>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f\u3092\u4f7f\u3063\u3066\u7df4\u7fd2\u554f\u984c\u3092\u89e3\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box\"><div class=\"cap_box_ttl\"><span>\u7df4\u7fd2\u554f\u984c1<\/span><\/div><div class=\"cap_box_content\">\n<p>\u4e0b\u306e\u4e09\u89d2\u5f62\u306e\\(\\sin \\theta\\)\u3001\\(\\cos \\theta\\)\u3001\\(\\tan \\theta\\)\u3092\u6c42\u3081\u3088\u3002<\/p>\n<\/div><\/div>\n\n\n\n<p><span class=\"oomozi\">\u89e3\u7b54<\/span><\/p>\n\n\n\n<p>\\(\\sin \\theta\\)\u306f\u659c\u8fba\u306b\u5bfe\u3057\u3066\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u306eS\u306e\u52d5\u304d\u3067\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u659c\u8fba\u306e\u9577\u3055\u304c\\(\\sqrt{13}\\)\u3067\u3001\u7e26\u306e\u9577\u3055\u304c\\(2\\)\u306a\u306e\u3067\u3001<\/p>\n\n\n\n<p>\\[\\sin \\theta=\\displaystyle \\frac{2}{\\sqrt{13}}=\\frac{2\\sqrt{13}}{13}\\]<\/p>\n\n\n\n<p>\u6700\u5f8c\u306f\u5206\u6bcd\u304b\u3089\u30eb\u30fc\u30c8\u304c\u7121\u304f\u306a\u308b\u3088\u3046\u306b\u6709\u7406\u5316\u3092\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3067\\(\\sin \\theta\\)\u306e\u5024\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p>\u6b21\u306b\\(\\cos \\theta\\)\u3092\u6c42\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\(\\cos \\theta\\)\u306f\u659c\u8fba\u306b\u5bfe\u3057\u3066\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u306eC\u306e\u52d5\u304d\u3067\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u659c\u8fba\u306e\u9577\u3055\u304c\\(\\sqrt{13}\\)\u3067\u3001\u7e26\u306e\u9577\u3055\u304c\\(3\\)\u306a\u306e\u3067\u3001<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p>\\[\\cos \\theta=\\displaystyle \\frac{3}{\\sqrt{13}}=\\frac{3\\sqrt{13}}{13}\\]<\/p>\n\n\n\n<p>\\(\\cos \\theta\\)\u306e\u5024\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p>\u6700\u5f8c\u306b\\(\\tan \\theta\\)\u306e\u5024\u3092\u6c42\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\(\\tan \\theta\\)\u306f\u7e26\u306e\u9577\u3055\u3092\u6a2a\u306e\u9577\u3055\u3067\u5272\u308b\u3068\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6a2a\u306e\u9577\u3055\u304c3\u3067\u3001\u7e26\u306e\u9577\u3055\u304c2\u306a\u306e\u3067\u3001<\/p>\n\n\n\n<p>\\[\\tan \\theta=\\displaystyle \\frac{2}{3}\\]<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p>\u3053\u308c\u3067\\(\\sin \\theta , \\cos \\theta , \\tan \\theta\\)\u306e\u5024\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8s,c,t\u306e\u52d5\u304d\u3092\u899a\u3048\u3066\u3044\u308c\u3070\u3001\\(\\sin , \\cos , \\tan \\)\u306e\u5024\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>\u7df4\u7fd2\u554f\u984c2<\/span><\/div><div class=\"cap_box_content\">\n<p>\u4e0b\u306e\u4e09\u89d2\u5f62\u306b\u304a\u3044\u3066\u3001\\(\\sin \\theta=\\displaystyle \\frac{3}{5}\\)\u3001\\(\\cos \\theta=\\displaystyle \\frac{4}{5}\\)\u306e\u3068\u304d\u3001\\(x,y\\)\u306e\u5024\u3092\u6c42\u3081\u3088\u3002<\/p>\n<\/div><\/div>\n\n\n\n<p>\u00a0<span class=\"oomozi\">\u89e3\u7b54<\/span><\/p>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u304c\u5206\u304b\u3063\u3066\u3044\u308b\u72b6\u614b\u3067\u3001\u5404\u8fba\u306e\u9577\u3055\u3092\u6c42\u3081\u308b\u7df4\u7fd2\u3092\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list is-style-bg_stripe\">\n<li>\u659c\u8fba\u306e\u9577\u3055 \u00d7 sin \u21d2\u7e26\u306e\u8fba\u306e\u9577\u3055<\/li>\n\n\n\n<li>\u659c\u8fba\u306e\u9577\u3055 \u00d7 cos \u21d2\u6a2a\u306e\u8fba\u306e\u9577\u3055<\/li>\n\n\n\n<li>\u6a2a\u306e\u8fba\u306e\u9577\u3055 \u00d7 tan \u21d2\u7e26\u306e\u9577\u3055<\/li>\n<\/ul>\n\n\n\n<p>\u7e26\u306e\u9577\u3055\\(y\\)\u306f\u3001\u659c\u8fba\u306b\u9577\u3055\u306b\\(\\sin \\theta \\)\u3092\u639b\u3051\u308b\u3053\u3068\u3067\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\ny&amp;=&amp;5\\times \\sin \\theta\\\\<br>\n\\displaystyle&nbsp;&amp;=&amp;5 \\times \\frac{3}{5}\\\\<br>\n&amp;=&amp;3<br>\n\\end{eqnarray}<\/p>\n\n\n\n<p>\u6a2a\u306e\u9577\u3055\u306f\\(x\\)\u306f\u3001\u659c\u8fba\u306e\u9577\u3055\u306b\\(\\cos \\theta \\)\u3092\u639b\u3051\u308b\u3068\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\\begin{eqnarray}<br>\nx&amp;=&amp;5 \\times \\cos \\theta\\\\<br>\n\\displaystyle &amp;=&amp;5 \\times \\frac{4}{5}\\\\<br>\n&amp;=&amp;4<br>\n\\end{eqnarray}<\/p>\n\n\n\n<p>&nbsp;<\/p>\n\n\n\n<p>\u4ee5\u4e0a\u304c\u7df4\u7fd2\u554f\u984c\u3067\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u5404\u8fba\u306e\u9577\u3055\u3084\u4e09\u89d2\u6bd4\u3092\u6c42\u3081\u3089\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"matome\">\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f(sin,cos,tan)\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f<span class=\"hutoaka\">\u4e09\u89d2\u6bd4\u306e\u516c\u5f0f\u3068\u899a\u3048\u65b9<\/span>\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p><span class=\"yellow-hoso\">\u3053\u308c\u306f\u57fa\u790e\u4e2d\u306e\u57fa\u790e\u306a\u306e\u3067\u3001\u3057\u3063\u304b\u308a\u3068\u62bc\u3055\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\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<p>\\begin{eqnarray}<br>\\sin \\theta &amp;=&amp;\\displaystyle \\frac{y}{r}\\\\<br>\\cos \\theta &amp;=&amp;\\displaystyle \\frac{x}{r}\\\\<br>\\tan \\theta &amp;=&amp;\\displaystyle \\frac{y}{x}<br>\\end{eqnarray}<\/p>\n<\/div><\/div>\n\n\n\n<p class=\"is-style-bg_stripe\">\u659c\u8fba\u306e\u9577\u3055 \u00d7 sin \u21d2\u7e26\u306e\u8fba\u306e\u9577\u3055<br>\u659c\u8fba\u306e\u9577\u3055 \u00d7 cos \u21d2\u6a2a\u306e\u8fba\u306e\u9577\u3055<br>\u6a2a\u306e\u8fba\u306e\u9577\u3055 \u00d7 tan \u21d2\u7e26\u306e\u9577\u3055<\/p>\n\n\n\n<p>\u4e09\u89d2\u6bd4\u306e\u8868\u3092\u4e38\u6697\u8a18\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u4e09\u89d2\u5f62\u306e\u8fba\u306e\u9577\u3055\u304b\u3089\u4e09\u89d2\u6bd4\u3092\u6c42\u3081\u3089\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><span class=\"huto\">\u4e09\u89d2\u6bd4\u306b\u306f\u91cd\u8981\u306a\u516c\u5f0f\u304c\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u3002<\/span><\/p>\n\n\n\n<p><span class=\"hutoaka\">\u6b63\u5f26\u5b9a\u7406<\/span>\u3084<span class=\"hutoaka\">\u4f59\u5f26\u5b9a\u7406<\/span>\u306b\u3064\u3044\u3066\u3082\u5225\u8a18\u4e8b\u3067\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e09\u89d2\u95a2\u6570\u306b\u82e6\u624b\u610f\u8b58\u304c\u3042\u308b\u9ad8\u6821\u751f\u306f\u5fc5\u898b\uff01 \\(\\sin,\\cos,\\tan\\)\u306e\u5024\u3092\u6697\u8a18\u3059\u308b\u306e\u306f\u52b9\u7387\u304c\u60aa\u3059\u304e\u307e\u3059\uff01 \u4e09\u89d2\u6bd4\u306e\u5024\u3092\u6697\u8a18\u3057\u3066\u3044\u308b\u3068 \u300c\\(\\displaystyle \\sin 60\u00b0\\)\u3063\u3066\u3044\u304f\u3064\u3060\u3063\u3051&#038;#82 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[34,222],"tags":[],"class_list":["post-2000","post","type-post","status-publish","format-standard","hentry","category-sankakuhi","category-math-1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u4e09\u89d2\u6bd4(sin,cos,tan)\u306e\u516c\u5f0f\u3068\u899a\u3048\u65b9\uff0130\u00b0\u30fb45\u00b0\u30fb60\u00b0\u306e\u5024\u4e00\u89a7\u3082\u7d39\u4ecb<\/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\/triangle-function\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4e09\u89d2\u6bd4(sin,cos,tan)\u306e\u516c\u5f0f\u3068\u899a\u3048\u65b9\uff0130\u00b0\u30fb45\u00b0\u30fb60\u00b0\u306e\u5024\u4e00\u89a7\u3082\u7d39\u4ecb\" \/>\n<meta property=\"og:description\" content=\"\u4e09\u89d2\u95a2\u6570\u306b\u82e6\u624b\u610f\u8b58\u304c\u3042\u308b\u9ad8\u6821\u751f\u306f\u5fc5\u898b\uff01 (sin,cos,tan)\u306e\u5024\u3092\u6697\u8a18\u3059\u308b\u306e\u306f\u52b9\u7387\u304c\u60aa\u3059\u304e\u307e\u3059\uff01 \u4e09\u89d2\u6bd4\u306e\u5024\u3092\u6697\u8a18\u3057\u3066\u3044\u308b\u3068 \u300c(displaystyle sin 60\u00b0)\u3063\u3066\u3044\u304f\u3064\u3060\u3063\u3051&amp;#82 [&hellip;]\" \/>\n<meta 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