I'm not quite sure what you're doing.
Just one application. You're almost done, except that you will have some trouble with convergence on the negative side.
The e^x should be e^ modulus x , but i can't seemed to key out the modulus thingy.
Ok, I tried the by parts method. Letting u = 1/e^mod x , and dv = x dx
but once i done it , i need to do by parts again. And it goes on and on...
What did i do to do it uncorrectly ?