જો $\sin \theta + 2\sin \phi + 3\sin \psi = 0$ અને $\cos \theta + 2\cos \phi + 3\cos \psi = 0$ હોય,તો $\cos 3\theta + 8\cos 3\phi + 27\cos 3\psi = $ ની કિંમત શોધો.

  • A
    $\cos (3\theta + 3\phi + 3\psi )$
  • B
    $18\cos (\theta + \phi + \psi )$
  • C
    $6\cos (\theta + \phi + \psi )$
  • D
    $36\cos (\theta + \phi + \psi )$

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