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Question Number 62205 by maxmathsup by imad last updated on 17/Jun/19
$${study}\:{the}\:{convergence}\:{of}\:\:\sum_{{n}\geqslant\mathrm{1}} \:\:\:{n}^{\mathrm{2}} \:{arctan}\left(\mathrm{1}+{e}^{−{n}} \right) \\ $$