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Question Number 33581 by abdo imad last updated on 19/Apr/18
$${find}\:{the}\:{nature}\:{of}\:\:\sum_{{n}=\mathrm{1}} ^{\infty} \left(−\mathrm{1}\right)^{{n}} \left(−\frac{\mathrm{1}}{{n}}\:+{arctan}\left(\frac{\mathrm{1}}{{n}}\right)\right)^{\frac{\mathrm{1}}{\mathrm{3}}} \\ $$