यदि $x = 3 \sin \theta$,$y = 3 \cos \theta \cos \phi$,और $z = 3 \cos \theta \sin \phi$ है,तो $x^{2} + y^{2} + z^{2} =$

  • A
    $18$
  • B
    $27$
  • C
    $9$
  • D
    $3$

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