三角関数 例

角度が${\displaystyle 0}$以上${\displaystyle 2\pi }$より小さくなるまで${\displaystyle 2\pi }$の回転を加えます。

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosecant is negative in the third quadrant.

${\displaystyle \csc \left(\frac{\pi }{4}\right)}$の厳密値は${\displaystyle \sqrt{2}}$です。