$\cot ^{-1}\left(\frac{1}{2}\right)+\cot ^{-1}\left(\frac{1}{3}\right)=$ . . . . . . .

  • A
    $-\frac{\pi}{4}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{5 \pi}{4}$
  • D
    $\frac{3 \pi}{4}$

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