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Homework Help: Indefinite integral

  1. Nov 15, 2005 #1
    I have:

    int (1/(sqrt -x^2 -2x))dx

    so I rewrite (-x^2-2x) --> 1-(x+1)^2 and swap those two.

    then I say t=x+1, and substitute that in.

    So now I have:

    int (1/(sqrt 1-t^2)) dt

    Here I get stuck, can anyone please help?
  2. jcsd
  3. Nov 15, 2005 #2
    That was an excellent substitution. Review the derivative of the arcsine function.
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