Trig Identities #14

Your goal to simplifying  trig functions is to end with one trig function. To do that, use trig identities, which cancel out some parts of the function. Your goal to verifying is to change one side into the other. One key is to build a brick wall. One hint isto start with the complicated side. Then, change all sines and cosines. Then, find denominators and use an identity. Finally, break up a fraction and factor. To simplify, use the unit circle and have all the same trig functions. Then, factor and DO NOT divide and cancel!