Precalculus Examples

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

Step 1

Add $\sin (2 x) \cos (2 x)$ and $\sin (2 x) \cos (2 x)$ .

$2 \sin (2 x) \cos (2 x)$

Step 2

Apply the sine double-angle identity.

$\sin (2 (2 x))$

Step 3

Multiply $2$ by $2$ .

$\sin (4 x)$