1. The problem statement, all variables and given/known data I am lost as to what to do here. 2. Relevant equations Integral of (lnx)/(4x) 3. The attempt at a solution let u = lnx let du = (1/x)dx (u)/(4x) dx... But then howdo you make 4x disappear in the equation? Typically I did it by making du = something in the equation I want to take out, but how can you make 1/x = 4x?