$\sum_{i=0}^2 \cot ^{-1}\{-(i+1)\}=$ . . . . . . .

  • A
    $-\frac{5 \pi}{2}$
  • B
    $-\frac{3 \pi}{2}$
  • C
    $\frac{\pi}{2}$
  • D
    $\frac{5 \pi}{2}$

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