# Math Help - simply the expression as far as possible

1. ## simply the expression as far as possible

i don't understand how 4 sin x cos x can be simplified into 2 sin 4x....can anyone show me the process?

2. Originally Posted by alessandromangione
i don't understand how 4 sin x cos x can be simplified into 2 sin 4x....can anyone show me the process?
$4\sin x \cos x=2\left ( 2\sin x\cos x \right )=2\sin2x$.

3. oh thanks...it was so easy haha