$\cot \left(\sum\limits_{n=1}^{50} \tan ^{-1}\left(\frac{1}{1+n+n^{2}}\right)\right)$ ની કિંમત શોધો.

  • A
    $\frac{26}{25}$
  • B
    $\frac{25}{26}$
  • C
    $\frac{50}{51}$
  • D
    $\frac{52}{51}$

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