જો $\sum_{k=1}^n \tan^{-1} \left( \frac{1}{k^2+k+1} \right) = \tan^{-1} ( \theta )$ હોય,તો $\theta =$

  • A
    $\frac{n}{n+2}$
  • B
    $\frac{n}{n+1}$
  • C
    $1$
  • D
    $\frac{n}{n-1}$

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