Precalculus Examples

$\cos (x) \cos (3 x) - \sin (x) \sin (3 x) = 0$

Step 1

The provided equation is not an identity.

$\cos (x) \cos (3 x) - \sin (x) \sin (3 x) = 0$ is not an identity

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