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$\sum_{i=1}^{\infty}arcc\tan\ \left(\frac{2\sqrt{3}}{2+\left(i+1\right)^2}\right).$
$\sum_{i=1}^{\infty}arcc\tan\ \left(\frac{2\sqrt{3}}{2+\left(i+1\right)^2}\right).$
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