Trigonometry Examples

$\cos (4 x) + \cos (2 x) = 2 - 2 \sin^{2} (2 x) - 2 \sin^{2} (x)$

Step 1

The provided equation is an identity.

$\cos (4 x) + \cos (2 x) = 2 - 2 \sin^{2} (2 x) - 2 \sin^{2} (x)$ is an identity