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Math Help - u-substitution help

  1. #1
    Newbie
    Joined
    Sep 2009
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    12

    u-substitution help

    evaluate the antiderivative of (e^x)/ (1+ e^(2x))dx and u=e^x
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  2. #2
    Junior Member
    Joined
    Nov 2009
    Posts
    50
    If u=e^x
    Then du=e^xdx

    \int \frac{1}{1+u^2}du=\arctan u+C=\arctan e^x+c
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