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? Thanks in advance.