Precalculus Examples

$\cos (x - 90) - \cos (x + 90) = 2 \sin (x)$

Step 1

The provided equation is not an identity.

$\cos (x - 90) - \cos (x + 90) = 2 \sin (x)$ is not an identity

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