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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Originally Posted by aervid 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. $\displaystyle u = x^2 + 1$? Just a little note..You may not need to use arctan(x) for every time you encounter $\displaystyle x^2 + 1$.
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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