Hard Examples
1) Use a cofunction identity
2) Use a pythagorean identity
3) Verify
1) Change to sines and cosines
2) Find common denominators
3) Add fractions
4) Factor out a sin x
5) Cancel
6) Change to sines and cosines
7) Multiply
8) Verify
Now try this one on your own!
You can find the solution in the Answers section under Examples.