Trigonometry Examples

$2 \cos^{2} (3 A) - 1$

Step 1

Apply the cosine double-angle identity.

$\cos (2 (3 A))$

Step 2

Multiply $3$ by $2$ .

$\cos (6 A)$

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