My first rule of thumb is to get everything in terms of sine and cosine. This will immediately solve 2 and 3.
Also look for and
Expand any expressions under exponents. ie. .
Finally simplify and see if you can factor anything after you have done the above steps.
It looks like you don't know any of the basic identities . . . *sigh*
Simplify each expression using the fundamental identities
We have: .
You're expected to know that: . .and .
Final answer: .
You're supposed to know that: .
. . and you should recognize: .
So we have: .