1. The problem statement, all variables and given/known data find the integral from 0 to ln2 of (e^x-1)/(e^x+1) 2. Relevant equations 3. The attempt at a solution I really didn't know what to do, but the book had a hint suggesting i multiply the numerator and denominator by e^-x and then use an appropriate substitution.. [((e^x)-1)*(e^-x)]/[((e^x)+1)*(e^-x)] = (1-(e^-x))/(1+(e^-x)) = (1-(e^x))/(1+(e^x)) but now i can't think of an appropriate substitution. help?