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Math Help - [SOLVED] Help on integrating

  1. #1
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    [SOLVED] Help on integrating

    I recognize that it is in the arctan x form but i dont know what to do with it, the numerator throws me off .

    X^3/ (x^2+1) dx

    I cant figure out how to change it or get rid of the x^3
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  2. #2
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    Quote Originally Posted by aervid View Post
    I recognize that it is in the arctan x form but i dont know what to do with it, the numerator throws me off .

    X^3/ (x^2+1) dx

    I cant figure out how to change it or get rid of the x^3
    Have you tried the sub. u = x^2  + 1?

    Just a little note..You may not need to use arctan(x) for every time you encounter x^2 + 1.
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  3. #3
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    I got it! thanks.

    Our teacher has been harping on us about arctan, arcsin, and acr sec x lately so that was what first jumped to my head. Ill keep that in mind.
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