{"url":"https://www.mynote-jp.com/entry/Triple-Angle-Identities","provider_url":"https://hatena.blog","title":"3\u500d\u89d2\u306e\u516c\u5f0f","image_url":null,"author_name":"IsThisAPen","height":"190","width":"100%","author_url":"https://blog.hatena.ne.jp/IsThisAPen/","provider_name":"Hatena Blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.mynote-jp.com%2Fentry%2FTriple-Angle-Identities\" title=\"3\u500d\u89d2\u306e\u516c\u5f0f - Notes_JP\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://www.mynote-jp.com/","type":"rich","version":"1.0","published":"2022-12-18 18:14:57","blog_title":"Notes_JP","categories":["\u6570\u5b66","\u6570\u5b66-\u9ad8\u6821\u6570\u5b66"],"description":"\u8907\u7d20\u6570\u3092\u4f7f\u3046\uff1a\u30c9\u30fb\u30e2\u30a2\u30d6\u30eb\u306e\u5b9a\u7406 \u52a0\u6cd5\u5b9a\u7406\u3092\u4f7f\u3046 \u56de\u8ee2\u884c\u5217\u3092\u4f7f\u3046 \u8907\u7d20\u6570\u3092\u4f7f\u3046\uff1a\u30c9\u30fb\u30e2\u30a2\u30d6\u30eb\u306e\u5b9a\u7406\u30c9\u30fb\u30e2\u30a2\u30d6\u30eb\u306e\u5b9a\u7406 - Wikipedia\u3092\u4f7f\u3046\uff0e$e^{i3\\theta} = (e^{i\\theta})^{3}$\u3060\u304b\u3089\\begin{aligned} e^{i3\\theta} & = \\cos 3\\theta + i \\sin 3\\theta \\\\ & \\!\\!\\!\\!\\!\\!\\!\\! \\| \\\\ (e^{i\\theta})^{3} &=(\\cos\\theta + i \\sin\\theta)^{3} \\\\ &=\\cos^{3}\\theta + 3\\cos^{2}\\theta \\cdot i \u2026"}