Precalculus Examples

$\cos (5 θ) + \cos (3 θ)$

Step 1

Use the triple-angle identity to transform $\cos (3 x)$ to $4 \cos^{3} (x) - 3 \cos (x)$ .

$\cos (5 θ) + 4 \cos^{3} (θ) - 3 \cos (θ)$

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