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Mathematics, 03.07.2019 16:00 southerntouch103

\sum _{n=0}^{\infty \: }\frac{\left(-1\right)^n\arctan \left(n\right)}{n^2}  . 

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[tex]\sum _{n=0}^{\infty \: }\frac{\left(-1\right)^n\arctan \left(n\right)}{n^2}[/tex]  .&nbs...
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