यदि $\tan ^{-1}x + \tan ^{-1}y + \tan ^{-1}z = \frac{\pi }{2}$ है,तो

  • A
    $x + y + z - xyz = 0$
  • B
    $x + y + z + xyz = 0$
  • C
    $xy + yz + zx + 1 = 0$
  • D
    $xy + yz + zx - 1 = 0$

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$\sec(\text{cosec}^{-1}x)$ किसके बराबर है?

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