1. The problem statement, all variables and given/known data I want to prove that: 2. Relevant equations 3. The attempt at a solution I tried using the trigonometric identity: sen2x = senx cosx / 2, so, I got: 1/2m∫(sen2x)mdx, x from 0 to pi/2, but now I don't know how to proceed. Can you help me please?