Trigonometry Examples

$\cos (a + b) + \cos (a + b) = 2 \cos (a) \cos (b)$

Step 1

The provided equation is not an identity.

$\cos (a + b) + \cos (a + b) = 2 \cos (a) \cos (b)$ is not an identity

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