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Homework Help: Interate the below fucntion from 0 to infinite please

  1. Sep 23, 2004 #1
    e^(-Nx^2)cos(Mx) dx = ??? (M,N are const)
    Please help. Thanks.
     
  2. jcsd
  3. Sep 23, 2004 #2
    :biggrin: I won't change anything in the above post before reading your posts :wink:
     
  4. Sep 24, 2004 #3

    Tide

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    Are you sure the limits aren't from negative infinity to positive infinity? Otherwise, you will end up with a complex error function (real part).
     
  5. Sep 24, 2004 #4
    I am sure, I check carefully, I aldready tried, its over 6 and a half pages but unable to get the valeu, you can check it yourself or you want to see my part ?
     
  6. Sep 24, 2004 #5

    Tide

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    This is what I get:
    [tex]Re \sqrt {\frac {\pi}{4m}} e^{i \frac {n^2}{4m}} \left( 1 + erf \left( \frac {im}{2\sqrt m} \right) \right)[/tex]
     
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