A Deriving Expression for Differentiation and Summation in Special Case

mahmud_dbm
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Dear Friends

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

upload_2016-12-27_1-2-7-png.110813.png


Is it okay ?? Or, i how should i proceed with this ?
 
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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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