Evaluate the integral(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \int \frac {1+x}{1+x^2}dx [/tex]

i let u = 1+x

du = dx

so

[tex]\int \frac {dx}{u^2}du [/tex]

or

[tex]\int u^-2du [/tex]

[tex] \frac {-1}{u} + C[/tex]

im not sure if this is right, the only other thing I can think of is to let u = (1+x)/(1+x^2) and then use the quotient rule.

Any feedback is much appreciated.

Thanks

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# Homework Help: Another substitiution question

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