{"version":"1.0","categories":["math-other"],"author_name":"derwind","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Frandommemory.hatenablog.com%2Fentry%2F2015%2F11%2F07%2F164911\" title=\"\u9ad8\u6821\u6570\u5b66 - \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>","image_url":null,"description":"\u3061\u3087\u3068\u516c\u5f0f\u3092\u4e26\u3079\u3088\u3046\u3002 \\begin{align} \\sin (\\alpha + \\beta) &= \\sin \\alpha \\cos \\beta + \\cos \\alpha \\sin \\beta \\hspace{5em} &(1) \\\\ \\cos (\\alpha + \\beta) &= \\cos \\alpha \\cos \\beta - \\sin \\alpha \\sin \\beta \\hspace{5em} &(2) \\\\ \\sin \\alpha + \\sin \\beta &= 2\\sin \\left(\\frac{\\alpha + \\beta}{2} \\right)\\cos \\left(\\fr\u2026","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/derwind/","width":"100%","title":"\u9ad8\u6821\u6570\u5b66","blog_url":"https://randommemory.hatenablog.com/","url":"https://randommemory.hatenablog.com/entry/2015/11/07/164911","blog_title":"\u3089\u3093\u3060\u3080\u306a\u8a18\u61b6","published":"2015-11-07 16:49:11","height":"190","provider_url":"https://hatena.blog","type":"rich"}