Question

$\frac{ {e }^{2 } - 1 }{ {e}^{2} + 1} = \frac{1}{11} + \frac{1}{31} + \frac{1}{51} .. \\ \: \: \: \: \: \: \: \: \: \: - - - - - - \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 1 + \frac{1}{21} + \frac{1}{41} ..$
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Answer 1

Answer:

I am not understanding your question