1. Mar 31, 2008 #1

   ehrenfest

   

   Can someone please explain why the result of the following has an imaginary part when I put it into mathematica 6.0?
   
   

   Code (Text):

   Sum[Sin[n 6]/2^n, {n, 1, Infinity}]

    

   ehrenfest, Mar 31, 2008
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3. Mar 31, 2008 #2

   DeepakS

   

   Because

   Code (Text):

   Sin[n 6] / 2^n

   is

   Code (Text):

   2^-n * Sin[n 6]

    

   DeepakS, Mar 31, 2008
4. Apr 1, 2008 #3

   Crosson

   

   Wrap it in a full simplify command:
   
   

   Code (Text):

   FullSimplify[Sum[Sin[n 6]/2^n, {n, 1, Infinity}]]

    

   Crosson, Apr 1, 2008
5. Apr 1, 2008 #4

   ehrenfest

   

   So what?

    

   ehrenfest, Apr 1, 2008

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