1. The problem statement, all variables and given/known data Prove this identity m) Sin^2 x / sin^2 x + cos x^2 = tan^2 x / 1 + tan^ x 2. Relevant equations http://i52.tinypic.com/105tdtk.jpg Letter (m) on the top 3. The attempt at a solution I dont know to much about trig identities, he barely taught anything. But apparently 1 is = to cos/cos and plenty of other things. I tried to solve the right side, the first thing i did was turn the 1 into sin^ x + cos ^ x. Then i turned the denominator into 1-sin^x - 1 + cos^x by subbing the values of cos^x , since cos^x = 1 - sin^2 . I know that tan^x = sin^x / cos^x , but the things that I am subbing in keep cancelling eachother out, does anyone know how to solve this?