Trigonometry Examples

$\cos (A + B) \cos (A - B) = \cos^{2} (A) - \sin^{2} (B)$

Step 1

The provided equation is an identity.

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

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