1. The problem statement, all variables and given/known data Int x/x^4+x^2+1 dx 2. Relevant equations u=x^2 dx=2x 3. The attempt at a solution I tried u=x^2+x+1 then du=2x+1 1/2 int u+1/u^2 du I thought I had it because it made a nice u/u^2 and 1/u^2 But no dice says the prof. He said let u=x^2 that gives me 1/2 int du/u^2+u+1/u but I'm stuck. Maybe partial fractions?