I need help solving these 2 proofs: (sec^2x-1)/(sec^2x) = sin^2x I am not sure what direction to go in. I know the top of the left side could be changed into: tan^2x/sec^2x, but I don't know what to do after that. The second one I need help with is: cos^2x/(1+tan^2x) = cot^2x I simplified it into: cos^2x/sec^2x = cos^2x/sin^2x, but I don't know what to do after that. Can you help me get the next few steps of these problems? Thanks!