1. The problem statement, all variables and given/known data Evaluate the integral: (int sign) Sech³xTanhx dx 2. Relevant equations Derivative of Sechx = -(SechxTanhx) 3. The attempt at a solution Rewrite as: Sech²xSechxTanhx U=sechx Du = -(SechxTanhx)dx -Du = SechxTanhx dx replace into integral -(integral sign) U²du Evaluate: -U³ / 3 answer = -Sech³x / 3 ??? It just seems like there should be more to it. What do you guys think?