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Question Number 85163 by mathmax by abdo last updated on 19/Mar/20
calculate Σ_(n=1) ^∞ arctan((1/(n^2 +n)))
$${calculate}\:\sum_{{n}=\mathrm{1}} ^{\infty} \:{arctan}\left(\frac{\mathrm{1}}{{n}^{\mathrm{2}} \:+{n}}\right) \\ $$

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