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Math Help - Is this u-subs?

  1. #1
    Junior Member
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    Jan 2009
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    52

    Is 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?
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  2. #2
    Junior Member
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    Yes this is substitution where:  u = x^2 +1
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