Answer
$\sin (2 \theta)=2 \sin (\theta) \cos(\theta)$
Work Step by Step
We know that the double angle formula for $\sin$ is:
$\sin (2x) =2 \sin x\cos x$
Here, $x=\theta$
Therefore, our result is:
$\sin (2 \theta)=2 \sin (\theta) \cos(\theta)$