{"version":"1.0","type":"rich","height":"190","url":"https://inamori.hateblo.jp/entry/20080117/p1","image_url":null,"title":"\u95a2\u6570\u306e\u901f\u5ea6\uff0811\uff09","author_name":"inamori","provider_name":"Hatena Blog","provider_url":"https://hatena.blog","categories":["\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0","C++"],"blog_url":"https://inamori.hateblo.jp/","width":"100%","blog_title":"inamori\u2019s diary","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Finamori.hateblo.jp%2Fentry%2F20080117%2Fp1\" title=\"\u95a2\u6570\u306e\u901f\u5ea6\uff0811\uff09 - inamori\u2019s diary\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","description":"\u524d\u56de\u306e\u306f[-\u03c0/2,\u03c0/2]\u3067\u6210\u308a\u7acb\u3063\u3066\u3044\u305f\u304c\u3001 \u5b9f\u6570\u5168\u57df\u3067\u3082\u6210\u308a\u7acb\u3064\u3088\u3046\u306b\u3057\u3088\u3046\u3002 \u7d20\u76f4\u306b\u66f8\u304f\u3068\u3001 double sin2(double x) { int i = (int)(x * (1 / M_PI) + 0.5); if(x i--; if(i & 1) x = i * M_PI - x; else x = x - i * M_PI; double x2 = x * x; return x * ((((1.0 / 362880 * x2 - 1.0 / 5040) * x2 + 1.0 / 120) * x2 - 1.0 / 6) * x2 + 1); }\u3053\u308c\u306748ns\u219231ns\u3002 \u3053\u2026","published":"2008-01-17 00:00:00","author_url":"https://blog.hatena.ne.jp/inamori/"}