यदि $\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=\pi$ और $x^2+y^2+z^2+k x y z=1$ है,तो $k$ का मान ज्ञात कीजिए।

  • A
    -$1$
  • B
    $1$
  • C
    -$2$
  • D
    $2$

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