半角の公式

$3$\displaystyle{{\sin }^{2} $ \frac{\hspace{2}{\alpha}\hspace{2}}{\hspace{2}2\hspace{2}} $ =\frac{\hspace{2} 1- \cos {\alpha} \hspace{2}}{\hspace{2}2\hspace{2}}}$ 　⇒

$3$\displaystyle{{\cos }^{2} $ \frac{\hspace{2}{\alpha}\hspace{2}}{\hspace{2}2\hspace{2}} $ =\frac{\hspace{2} 1+\cos {\alpha} \hspace{2}}{\hspace{2}2\hspace{2}}}$ 　⇒

⇒三角関数

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