hello!

I have to solve :

well:

if weknow that:

and

then what do we exactly do with 2xdx in the numerator? Dont we just have 2x too much???

many thanks!

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- Jul 22nd 2013, 04:53 AMBooint x/(x^2+1)
hello!

I have to solve :

well:

if weknow that:

and

then what do we exactly do with 2xdx in the numerator? Dont we just have 2x too much???

many thanks! - Jul 22nd 2013, 05:23 AMProve ItRe: int x/(x^2+1)
It's because when you substitute , that means . So

which you can now integrate. - Jul 22nd 2013, 09:22 AMBooRe: int x/(x^2+1)
Thanks!