1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    gabbagabbahey

    User Avatar
    Homework Helper
    Gold Member

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

    [tex]\frac{e}{e^x+e}=\frac{e+e^x-e^x}{e^x+e}=1-\frac{e^x}{e^x+e}[/tex]
     
  4. Apr 25, 2010 #3
    thanks for you help , that is a really slick trick
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Integral problem
  1. Integration problem (Replies: 4)

  2. Integral Problem (Replies: 31)

  3. Integration problem (Replies: 9)

  4. Integration Problem (Replies: 7)

Loading...