1. The problem statement, all variables and given/known data ∫(x^7/(1+x^16)dx 2. Relevant equations 3. The attempt at a solution I feel like it's so simple. I have tried making u equal to 1+x^16 and then trying to find some sort of chain I can use to make the equation work but no luck. When i saw that arctan was in the correct answer I was lost. Any help appreciated.