Trigonometry Examples

$\cos (x) \cos (y) = \frac{1}{2} \cdot (\sin (x + y) + \sin (x - y))$

Step 1

The provided equation is not an identity.

$\cos (x) \cos (y) = \frac{1}{2} \cdot (\sin (x + y) + \sin (x - y))$ is not an identity