View Single Post
  #2  
Old 11-11-2007, 10:20 PM
rufus rufus is offline
Senior Member
 
Join Date: Aug 2005
Posts: 425
Default Re: Geometric Series

[ QUOTE ]
I realize geometric series isn't exactly probability, but attracts the mathematically-inclined posters, so here goes. I also posted in the SMP forum.

I need to show that:

2*sum[ (( 1/3)^t) * cos(wt) ]
where we are summing from t=1 to inf, is equal to:
( 1 - 3cos(w) ) / ( 3cos(w) - 5 )

Any links/tips would be helpful. I haven't been able to find anything via google.

[/ QUOTE ]

You're going to have better results for a question like this in the homework section of http://www.physicsforums.com/
(They also have latex support there so you can make your post more legibly.)

Have you seen:
e^(i theta)=cos theta + i sin theta
?
Reply With Quote