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Homework Help: Find integrals

  1. Dec 9, 2006 #1
    Find the two integrals:
    [tex]\int_0^{\infty}\frac{e^{-\alpha x^2}}{x^2+1}\sin(\alpha x) \, dx [/tex]
    [tex]\int_0^{\infty}e^{-\beta^2t}\cos(\beta x) \, d\beta [/tex]

    Any hint?
     
  2. jcsd
  3. Dec 9, 2006 #2
    As you have not provided any of your own work, that is all I can give. You should have some kind of book or lists with definition of some ways to perform integration, such as reverse chain rule, u substitution, integration by parts and so on.

    Which one(s) can you apply here?
     
  4. Dec 9, 2006 #3
    Or complex integration ???


    marlon
     
  5. Dec 10, 2006 #4

    daniel_i_l

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    Gold Member

    parts + substitution
     
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