Pre-Algebra Examples

$\cos (9 x) \cos (x) + \sin (9 x) \sin (x)$

Step 1

Graph.

$\cos (9 x) \cos (x) + \sin (9 x) \sin (x)$

Step 2

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