Trigonometry Examples

$\cos (3 x) = \cos (x) (\cos (2 x) - 2 \sin^{2} (x))$

Step 1

The provided equation is an identity.

$\cos (3 x) = \cos (x) (\cos (2 x) - 2 \sin^{2} (x))$ is an identity

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