Precalculus Examples

$5 \cos (2 x) = - 15 \cos (x) - 10$

Step 1

The provided equation is not an identity.

$5 \cos (2 x) = - 15 \cos (x) - 10$ is not an identity

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