1. The problem statement, all variables and given/known data ∫(exp(6x))/(exp(12x)+25)dx 2. Relevant equations answer: -arctan[5/exp(6*x)]/30 3. The attempt at a solution honestly, don't know where to start. i was looking at another forum and tried to set u=exp(x) du=exp(x) and dx=du/u. plugging that in i got u^6/(u^12+25)*du/u. not sure where to go from there or if that is even the way to go.