Limits...

Calculus Level 3

\[\large \lim_{n \to \infty} \sum_{m=1}^n \tan^{-1} \frac 1{1+m+m^2} = ?\]

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Note: \(\tan^{-1} x \in \left(-\dfrac \pi 2, \dfrac \pi 2 \right)\)

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