初等関数の性質(1)

(1)
\begin{align}
\arcsin(-1) &= – \frac{\pi}{2}
\end{align}

(2)
\begin{align}
\arcsin\left(- \frac{3}{2}\right) &= – \frac{\pi}{3}
\end{align}

(3)
\begin{align}
\arccos\frac{1}{2} &= \frac{\pi}{3}
\end{align}

(4)
\begin{align}
\arccos\frac{\sqrt{3}}{2} &= \frac{\pi}{6}
\end{align}

(5)
\begin{align}
\arccos\left(\sin\frac{\pi}{6}\right) &= \frac{\pi}{3}
\end{align}

(6)
\begin{align}
\arctan\frac{\sqrt{3}}{3} &= \frac{\pi}{6}
\end{align}