$\cot \left[\sum_{n=3}^{32} \cot ^{-1}\left(1+\sum_{k=1}^n 2 k\right)\right]=$

  • A
    $\frac{10}{3}$
  • B
    $\frac{8}{3}$
  • C
    $\frac{14}{3}$
  • D
    $\frac{16}{3}$

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