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$\large\tan^{-1} \left(\dfrac{1}{1 + 1\cdot2}\right) + \tan^{-1} \left(\dfrac{1}{1 + 2\cdot3}\right) + \cdots +\tan^{-1} \left(\dfrac{1}{1 + n(n+1)}\right)$ If above expression is equal to $\tan^{-1}\theta$,then find $\theta$.

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