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Homework Help: 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


    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


    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:

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