This going to sound dumb, but say if I'm given something like cos(nθ), is there any way at all to get the n out?

You see, I'm stuck on my math assignment. It looks like I've almost got it, but I think I may have driven myself into a corner because I have to do the above after reducing powers.

I've never been good at proving trigonometric identities and stuff.

EDIT: Well, at least I'll get half-credit for this assignment. I can do the other half of it, which is to prove the exact same identity with a different method.

## Bookmarks