Express sin4x in terms of sinx?

Main Question or Discussion Point

express sin4x in terms of sinx???

Alright so im working on my homework tonight (i'm in trig/calc), and I get everything done but the last problem. Anyways, Ive been working on this for a while now and I cant even get an idea of where to start. Anyways, he says we need to express sin4x in terms of sinx. Can anyone help me out as to how to do this?

Tide
Homework Helper
HINT:

$$\sin 4x = 2 \sin 2x \cos 2x$$

VietDao29
Homework Helper
kgh0st said:
Alright so im working on my homework tonight (i'm in trig/calc), and I get everything done but the last problem. Anyways, Ive been working on this for a while now and I cant even get an idea of where to start. Anyways, he says we need to express sin4x in terms of sinx. Can anyone help me out as to how to do this?