1. The problem statement, all variables and given/known data ∫8x3e-cos(x4+4)sin(x4+4)dx 2. Relevant equations Let u = cos(x4+4) 3. The attempt at a solution I know the answer does not have the sin in it and only the e remains, because when the integral is found e stays unchanged. I could find somewhere online to calculate it, but I want to know how to do it, because questions like this will be on the final exam.