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A Differentiation and Summation

  1. Dec 27, 2016 #1
    Dear Friends

    So, i have this special case where i have to do a differentiation and summation.
    Please check the following.


    Is it okay ?? Or, i how should i proceed with this ?
  2. jcsd
  3. Dec 28, 2016 #2


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    Gold Member

    ok, what you did in the bracket were algebraic operations and the use of the formula for geometric series ##\sum_{k=0}^{N-1}t^{k}=\frac{t^{N}-1}{t-1}## where ##k=e^{-j\pi(2n/N-1)}##, now you must derive the expression respect ##\chi## ...
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