I'm pretty sure its substitution rule but I don't know what to put as the u
Last edited by s0urgrapes; March 6th 2008 at 12:29 AM.
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Originally Posted by xifentoozlerix thanks! just a question, how do you get du/u^2 in the first one, how come it isn't du/u
Well, let's see what happens if you do :
As you can see, the term cancels and you end up with a different integral. With however, the top in the numerator is taken care of, and it leaves the in the denominator as the original problem had:
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