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Homework Help: Can you tell me how to prove it?

  1. Jan 27, 2010 #1
    can you tell me how to prove the second formula according to the first formula in the attachment?
     

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  2. jcsd
  3. Jan 27, 2010 #2
    In the exponential of the first formula, rewrite the dot product in terms of things you know (magnitudes and angles) by picking/defining your q-vector to be along the z-hat direction. After that, write the measure in spherical coordinates and run with it.
     
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