Precalculus Examples

$\sin^{4} (θ) = \frac{3}{8} - \frac{1}{2} \cos (2 θ) + \frac{1}{8} \cos (4 θ)$

Step 1

The provided equation is an identity.

$\sin^{4} (θ) = \frac{3}{8} - \frac{1}{2} \cdot \cos (2 θ) + \frac{1}{8} \cdot \cos (4 θ)$ is an identity