1. May 24, 2008 #1

   electronic engineer

   

   Hello.I actually didn't know exactly how do we get to the second line with this integration.

    

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   electronic engineer, May 24, 2008
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3. May 24, 2008 #2

   Defennder

   

   Homework Helper

   Integrate this by splitting up the interval on which it is done:
   
   [tex]\int^L_{-L} f(t) dt = \int^L_{0} f(t) dt + \int^0_{-L} f(-t) dt [/tex]
   
   Then you'll be able to remove the '| |' and integrate it normally. When you're done with the integration, just substitute in the limits and let L approach infinity.

    

   Defennder, May 24, 2008

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