Hi,

I have the following -periodic function:

I've computed the Exponential Fourier Series for the given function:

(1)

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I need to compute the following sum:

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The Parseval's identity is:

(2)

(3)

(4)

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What is:

Isn't it:

Is (3) and (4) correct?

I would greatly appriciate guidance to compute the sum.

Thank you