Trigonometry Examples

$\cos (- x) - \cos (x)$

Step 1

Since $\cos (- x)$ is an even function, rewrite $\cos (- x)$ as $\cos (x)$ .

$\cos (x) - \cos (x)$

Step 2

Subtract $\cos (x)$ from $\cos (x)$ .

$0$

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