derwind https://blog.hatena.ne.jp/derwind/ らんだむな記憶 https://randommemory.hatenablog.com/ math-other ちょと公式を並べよう。 \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… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Frandommemory.hatenablog.com%2Fentry%2F2015%2F11%2F07%2F164911" title="高校数学 - らんだむな記憶" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2015-11-07 16:49:11 rich https://randommemory.hatenablog.com/entry/2015/11/07/164911 1.0 100%