{"width":"100%","categories":["machine_learning","math-other"],"image_url":null,"url":"https://randommemory.hatenablog.com/entry/2020/05/05/144548","author_url":"https://blog.hatena.ne.jp/derwind/","blog_url":"https://randommemory.hatenablog.com/","provider_name":"Hatena Blog","provider_url":"https://hatena.blog","blog_title":"\u3089\u3093\u3060\u3080\u306a\u8a18\u61b6","description":"$x \\in \\R^1$ \u3068\u3059\u308b\u6642\u3001 \\begin{align} e^{ix} = \\cos(x) + i \\sin(x) \\end{align} \u306b\u3088\u308a\\begin{align} \\cos(x) = \\frac{e^{ix} + e^{-ix}}{2},\\ \\sin(x) = \\frac{e^{ix} - e^{-ix}}{2i},\\ \\tan(x) = \\frac{e^{ix} - e^{-ix}}{i (e^{ix} + e^{-ix})} \\end{align} \u3067\u3042\u3063\u305f\u3002\u3053\u308c\u3068\u985e\u578b\u306e\u5f62\u72b6\u3092\u6301\u3064\u53cc\u66f2\u7dda\u51fd\u6570\u306f$$ \\cosh(x) = \\frac{e^{x} + e^{-x}}{2},\\\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Frandommemory.hatenablog.com%2Fentry%2F2020%2F05%2F05%2F144548\" title=\"\u30cb\u30e5\u30fc\u30e9\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u6570\u7406\u7684\u69cb\u9020 (1) - \u3089\u3093\u3060\u3080\u306a\u8a18\u61b6\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2020-05-05 14:45:48","type":"rich","height":"190","title":"\u30cb\u30e5\u30fc\u30e9\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u6570\u7406\u7684\u69cb\u9020 (1)","author_name":"derwind","version":"1.0"}