Trigonometry Examples

$2 \cos^{2} (\frac{θ}{5}) - 1$

Step 1

Apply the cosine double-angle identity.

$\cos (2 \frac{θ}{5})$

Step 2

Combine $2$ and $\frac{θ}{5}$ .

$\cos (\frac{2 θ}{5})$

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