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Q)

$\tan^{-1} x + \cot^{-1} (x+1)$ is equal to :


( A ) $\cot^{-1} (x^2 + x + 1)$
( B ) $\tan^{-1} (x^2 + x)$
( C ) $\tan^{-1}(x^2 + x +1)$
( D ) $cot^{-1} (x^2+x)$

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