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Homework Help: Help with Indefinite integrals.

  1. Sep 10, 2008 #1
    1. The problem statement, all variables and given/known data
    [tex]\int sinx/(1+cos^{2}x)dx [/tex]


    Can anyone help me with this problem?
     
    Last edited: Sep 10, 2008
  2. jcsd
  3. Sep 10, 2008 #2

    Dick

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    Did you try substituting u=cos(x) as a first step??
     
  4. Sep 10, 2008 #3
    Ah ok, that was my biggest problem. I tried substituting u=1+cos^2x and u=sinx. But neither yielded the result I wanted.

    So I will try using just u=cosx and see how that works for me.
     
  5. Sep 10, 2008 #4
    Ok, I got that one finally.

    How about this one?

    [tex]\int x^{2}sinx/1+x^{6} dx [/tex]

    I tried u=sinx, but got stuck. Is that what I need to use? Any help would be appreciated.
     
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