1. The problem statement, all variables and given/known data Prove: cotAcotB=(cscB+cotA)/(tanAsecB+tanB) 2. Relevant equations cotx=1/tanx, etc. I tried using pythagorean identities, like 1+cot2x=csc2x, and others, but I've been unable to solve the problem. 3. The attempt at a solution Please help me out. The examples in my text book don't seem very useful here. I've tried everything I could think of.