Evaluate the sum

*(Seraphim Tsipelis)*

**Solution **[pprime]

We have successively:

We are invoking Kummer’s formula for the evaluation of the last sum. Evaluating the Fourier series that appear for we get that

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Evaluate the sum

*(Seraphim Tsipelis)*

**Solution **[pprime]

We are invoking Kummer’s formula for the evaluation of the last sum. Evaluating the Fourier series that appear for we get that