삼각법 예제

$\cos (56 x) \cos (54 x) + \sin (56 x) \sin (54 x)$

단계 1

$\cos (56 x) \cos (54 x) + \sin (56 x) \sin (54 x)$

단계 2

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