Trigonometry Examples

$2 \cos^{2} (x) + \cos (x) - 1$

Step 1

Move $- 1$ .

$2 \cos^{2} (x) - 1 + \cos (x)$

Step 2

Apply the cosine double-angle identity.

$\cos (2 x) + \cos (x)$

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