1. The problem statement, all variables and given/known data I'm trying to understand how they got du in this problem. It is an integration by parts question. Anyway, the question asks me to evaluation this integral by using integration by parts two times 2. Relevant equations This is how we would solve the problem... 3. The attempt at a solution This is the first step. The solution to the entire problem isn't what I need. I'll be able to get that after I figure out how they got du. I just need to see how you get du. What it looks like they did was just go 2*(ln x^21)*(1/x)*(21x^2) This isn't equal to the answer, though. Any ideas? No need to rush on this. The assignment is done, I just got monumentally frustrated with this one. Thanks in advance to anyone that can help.