Trigonometry Examples

$\cos (x + y) + \cos (x - y) = 2 \cos (x \cos (y))$

Step 1

The provided equation is not an identity.

$\cos (x + y) + \cos (x - y) = 2 \cos (x \cos (y))$ is not an identity

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