Algebra Examples

$\sin (\frac{x}{7}) \sin (\frac{x}{7}) = \frac{1}{2} (1 - \cos (\frac{2 x}{7}))$

Step 1

The provided equation is an identity.

$\sin (\frac{x}{7}) \sin (\frac{x}{7}) = \frac{1}{2} \cdot (1 - \cos (\frac{2 x}{7}))$ is an identity