Ah okay now it is easy. if sin to the six theta is simply sin theta to the power of six, then you can substitute 'just the sin theta' . I didn't know if that six in there made it one whole thing but now I see that it's simple. I've never seen that before. Yes I've got it! Thank you both! (:
There is a problem after that (#27) that is almost exactly the same thing:
I would expect everything to be the same except it is now 5 theta. But they are saying you should get (1/35) times sin of 5 theta to the seven instead of what I got which was (1/7) times that. Confused...