Need help, soon please!! Integrating I am struggling to integrate this function since last night but,it seems like it is a dead end doing it. how would you integrate this function integral x^n e^(-x^(n-1)) dx i tried the parcial method, and went like this integ x^(n-2) x^2 e^(-x^(n-1))= then i did this u=x^2,du=2xdx v=integ x^(n-2) e^(-x^(n-1)), then i took the substitution -x^(n-1)=t -(n-1)x^(n-2)dx=dt x^(n-2)dx=-1/(n-1)dt, than i get -1/(n-1)integ e^t dt=-1/(n-1) e^(-x^(n-1)) then using the formula uv-integ vdu, i get -1/(n-1)x^2 e^(-x^(n-1))+ 2/(n-1) integ e^(-x^(n-1)) xdx, so the problem is how to integrate now this integ e^(-x^(n-1)) xdx, i could expand it using taylor formula, but i just have a feeling that it should be done using some other methods.!! I do not know if my approach is correct at first place, i might be missing something here. Any help please?