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calculste-n-1-arctan-2-n-2-




Question Number 34671 by math khazana by abdo last updated on 09/May/18
calculste Σ_(n=1) ^∞   arctan((2/n^2 )).
$${calculste}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:\:{arctan}\left(\frac{\mathrm{2}}{{n}^{\mathrm{2}} }\right). \\ $$

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