Trigonometry Examples

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

Step 1

The provided equation is not an identity.

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

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