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Changing the limits of integration

  1. Dec 4, 2011 #1
    ! SOLVED !

    This isn't a homework problem, just an equation in my chapter. I don't see how the two integrals pointed to by the blue arrows become the integral pointed to by the red arrow. I know that if you swap the limits of integration, you change the sign of the integral. However, how do you change the -pi to pi in the second integral?

    6UBRk.jpg
     
    Last edited: Dec 4, 2011
  2. jcsd
  3. Dec 4, 2011 #2

    hunt_mat

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    Homework Helper

    Use the substitution u=-x
     
  4. Dec 4, 2011 #3
    Of course, thanks.
     
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