Yeah i noticed i did the dx part wrong, was about to send another pm hehe.
No, but you didn't substitute at allOriginally Posted by Firstone
Transform your integral : every x has to disappear. So as soon as you encounter , change it into u. If there was that you encounter, then and substitute too.
And then integrate by parts as recommended. Don't forget to either change the boundaries of the integral, either to substitute back u.
P.S. : please next time, post a new thread. It may be useful for some other people (and my PM box is overwhelmed by all these messages lol!)