integral of x/(x^2+1) = (ln(x^2+1))/2

Is this solution reached by u-substitution or some property of ln?

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- Feb 11th 2009, 08:11 AMTYTYIs this u-subs?
integral of x/(x^2+1) = (ln(x^2+1))/2

Is this solution reached by u-substitution or some property of ln? - Feb 11th 2009, 09:32 AMAmanda H
Yes this is substitution where: $\displaystyle u = x^2 +1 $