삼각법 예제

$\cos (2 x) + \cos (3 x) + \cos (4 x) + \cos (5 x) = 0$

단계 1

$\cos (2 x) + \cos (3 x) + \cos (4 x) + \cos (5 x) = 0$

단계 2

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$