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$\begin{aligned} && \tan^{-1} \left(\frac2{2+1^2+1^4}\right) \\ &+& \tan^{-1} \left(\frac4{2+2^2+2^4}\right) \\ &+& \tan^{-1} \left(\frac6{2+3^2+3^4}\right) \\ &+& \ldots = \ ? \end{aligned}$

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