Please help! Math Problem, trig identities.?

Question

It's number 36:

http://i254.photobucket.com/albums/hh111/groupiegurl14334/numba36.jpg

and please do not say "do your own work!" because this packet is huge.. and I've finished the whole thing three separate times already... except this question.

Answer 1

For (a) - use identity C and y = -x.  Remember that sin(-x) = - sin(x)

For (b) - use identity D and y = x

For (c) - Use identity C and y = x

For (d) - Use the results of (c) and (a)

For (e) - Exactly the same as (d) but the other way

For (f) - Use the results from (d).  Substitute y/2 for x.  You'll have to be a little clever then.

For (g) - Same as (f) but start with the results from (e).