1. The problem statement, all variables and given/known data I'm unable to integrate the following function with respect to x [-inf, +inf]: 2. Relevant equations exp(y*x)*(1+exp(x))^(-n)dx 3. The attempt at a solution I tried to expand the function by distributing the exponent (-n) across the rightmost product, but I don't think its possible. Does a clever substitution method exist?