જો $\alpha+\beta+\gamma=2 \theta$ હોય,તો $\cos \theta+\cos (\theta-\alpha)+\cos (\theta-\beta)+\cos (\theta-\gamma)$ ની કિંમત શોધો.

  • A
    $4 \sin \frac{\alpha}{2} \cdot \cos \frac{\beta}{2} \cdot \sin \frac{\gamma}{2}$
  • B
    $4 \cos \frac{\alpha}{2} \cdot \cos \frac{\beta}{2} \cdot \cos \frac{\gamma}{2}$
  • C
    $4 \sin \frac{\alpha}{2} \cdot \sin \frac{\beta}{2} \cdot \sin \frac{\gamma}{2}$
  • D
    $4 \sin \alpha \cdot \sin \beta \cdot \sin \gamma$

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