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Integral problem

  1. Apr 25, 2010 #1
    1. The problem statement, all variables and given/known data
    integrate 1/((e^(x-1)+1))
    and (x)/((e^(x-1)+1))

    3. The attempt at a solution
    i tried using integration parts , and partial fractions but i am not really sure what to do
    any help will be much appreciated .
  2. jcsd
  3. Apr 25, 2010 #2


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    Homework Helper
    Gold Member

    I'd start by multiplying both numerator and denominator by [itex]e[/itex]...after that, just use the following trick:

  4. Apr 25, 2010 #3
    thanks for you help , that is a really slick trick
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