삼각법 예제

$\cos (x) \cos (7 x) - \sin (x) \sin (7 x) = 0$

단계 1

$\cos (x) \cos (7 x) - \sin (x) \sin (7 x) = 0$

단계 2

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