मान ज्ञात कीजिए: $\cot ^{ - 1}\left(\frac{xy + 1}{x - y}\right) + \cot ^{ - 1}\left(\frac{yz + 1}{y - z}\right) + \cot ^{ - 1}\left(\frac{zx + 1}{z - x}\right)$

  • A
    $0$
  • B
    $1$
  • C
    $\cot ^{ - 1}x + \cot ^{ - 1}y + \cot ^{ - 1}z$
  • D
    इनमें से कोई नहीं

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