1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How to rewrite the provided sum in another form?

  1. Jul 29, 2014 #1
    1. The problem statement, all variables and given/known data

    How to get from

    Sum of 2(cos((3pi)/(2^(k+1)))sin(pi/(2^(k+1)))) from k = 1 to infinity

    to

    Sum of sin((4pi)/(2^(k+1))) - sin((2pi)/(2^(k+1))) from k = 1 to infinity

    The two expressions are equivalent. I need help getting from the first expression to the second.
     
  2. jcsd
  3. Jul 29, 2014 #2

    LCKurtz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Your posts would be much easier to read if you would learn to use tex. I'm guessing you need the product to sum formulas:

    http://www.sosmath.com/trig/prodform/prodform.html
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: How to rewrite the provided sum in another form?
  1. Rewriting a sum (Replies: 5)

Loading...