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Homework Help: Help W/ Integration-Calc 1

  1. Jul 23, 2008 #1
    Help W/ Integration--Calc 1

    Hey everybody,
    I have a problem that I don't know how to solve...can someone help me out:
    Integral (1/(1+e^x))dx
  2. jcsd
  3. Jul 23, 2008 #2
    Re: Help W/ Integration--Calc 1

    Try using substitution first for [itex] u=e^x [/itex] which will give you

    [tex] \int \frac{du}{u(1+u)}[/tex]
    and then use partial fractions to get some [itex] A,B[/itex] where

    [tex] \int \frac{A}{u}du + \int \frac{B}{1+u}du[/tex]

    and from there try and see if you can find a solution.
  4. Jul 23, 2008 #3


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    Homework Helper

    Re: Help W/ Integration--Calc 1

    You can use the substitution jeffreydk said or use u=1+e^x. Both are fine.
  5. Jul 24, 2008 #4
    Re: Help W/ Integration--Calc 1

    Thanks guys, so much...answer wasn't too difficult after that.
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