三角関数各象限値表

第一象限

度数法[°]	\[0\]	\[30\]	\[45\]	\[60\]	\[90\]
弧度法[rad]	\[0\]	\[\frac{\pi}{6}\]	\[\frac{\pi}{4}\]	\[\frac{\pi}{3}\]	\[\frac{\pi}{2}\]
\[\sin\theta\]	\[0\]	\[\frac{1}{2}\]	\[\frac{\sqrt{2}}{2}\]	\[\frac{\sqrt{3}}{2}\]	\[1\]
\[\cos\theta\]	\[1\]	\[\frac{\sqrt{3}}{2}\]	\[\frac{\sqrt{2}}{2}\]	\[\frac{1}{2}\]	\[0\]
\[\tan\theta\]	\[0\]	\[\frac{1}{\sqrt{3}}\]	\[1\]	\[\sqrt{3}\]	\[\infty\]

第二象限

度数法[°]	\[90\]	\[120\]	\[135\]	\[150\]	\[180\]
弧度法[rad]	\[\frac{\pi}{2}\]	\[\frac{2\pi}{3}\]	\[\frac{3\pi}{4}\]	\[\frac{5\pi}{6}\]	\[\pi\]
\[\sin\theta\]	\[1\]	\[\frac{\sqrt{3}}{2}\]	\[\frac{\sqrt{2}}{2}\]	\[\frac{1}{2}\]	\[0\]
\[\cos\theta\]	\[0\]	\[-\frac{1}{2}\]	\[-\frac{\sqrt{2}}{2}\]	\[-\frac{\sqrt{3}}{2}\]	\[-1\]
\[\tan\theta\]	\[\infty\]	\[-\sqrt{3}\]	\[-1\]	\[-\frac{1}{\sqrt{3}}\]	\[0\]

第三象限

度数法[°]	\[180\]	\[210\]	\[225\]	\[240\]	\[270\]
弧度法[rad]	\[\pi\]	\[\frac{7\pi}{6}\]	\[\frac{5\pi}{4}\]	\[\frac{4\pi}{3}\]	\[\frac{3\pi}{2}\]
\[\sin\theta\]	\[0\]	\[-\frac{1}{2}\]	\[-\frac{\sqrt{2}}{2}\]	\[-\frac{\sqrt{3}}{2}\]	\[-1\]
\[\cos\theta\]	\[-1\]	\[-\frac{\sqrt{3}}{2}\]	\[-\frac{\sqrt{2}}{2}\]	\[-\frac{1}{2}\]	\[0\]
\[\tan\theta\]	\[0\]	\[\frac{1}{\sqrt{3}}\]	\[1\]	\[\sqrt{3}\]	\[-\infty\]

第四象限

度数法[°]	\[270\]	\[300\]	\[315\]	\[330\]	\[360\]
弧度法[rad]	\[\frac{3\pi}{2}\]	\[\frac{5\pi}{3}\]	\[\frac{7\pi}{4}\]	\[\frac{11\pi}{6}\]	\[2\pi\]
\[\sin\theta\]	\[-1\]	\[-\frac{\sqrt{3}}{2}\]	\[-\frac{\sqrt{2}}{2}\]	\[-\frac{1}{2}\]	\[0\]
\[\cos\theta\]	\[0\]	\[\frac{1}{2}\]	\[\frac{\sqrt{2}}{2}\]	\[\frac{\sqrt{3}}{2}\]	\[1\]
\[\tan\theta\]	\[-\infty\]	\[-\sqrt{3}\]	\[-1\]	\[-\frac{1}{\sqrt{3}}\]	\[0\]