1. The problem statement, all variables and given/known data I have three separate equations that I would really appreciate your help on. 2. Relevant equations The first is (lnx)^2 dx The Second is e^x sin(3x) dx The third is a definitive integral between pi and zero, sin^3(x) dx 3. The attempt at a solution I am unsure as to how to go about the second two, but would the first go something like lnx=u x=e^y dx=e^u du Integration comes quite badly to me. I would appreciate a step by step to see what I am actually meant to be doing.