Board index Computation of Series Closed series involving tanh

## Closed series involving tanh

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### Closed series involving tanh

Thu May 19, 2016 8:45 am

Posts: 47

Evaluate (in a closed form, if possible) the series:

$$\sum_{n=1}^{\infty} \frac{(-1)^{n-1}}{n \tanh n}$$