यदि $\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=3 \pi$ है,तो

  • A
    $x+y+z-3=0$
  • B
    $x+y+z+3=0$
  • C
    $x+2 y+3 z-5=0$
  • D
    $x-y-z=0$

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