જો $\cos \alpha + \cos \beta + \cos \gamma = 0$ અને $\sin \alpha + \sin \beta + \sin \gamma = 0$ હોય,તો $\cos 2\alpha + \cos 2\beta + \cos 2\gamma$ ની કિંમત શોધો.

  • A
    $2\cos (\alpha + \beta + \gamma)$
  • B
    $\cos 2(\alpha + \beta + \gamma)$
  • C
    $0$
  • D
    $1$

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