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