જો $\sin (\theta-\alpha), \sin \theta$ અને $\sin (\theta+\alpha)$ એ $H.P.$ માં હોય,તો $\cos 2 \theta$ ની કિંમત શોધો.

  • A
    $1+4 \cos ^2 \frac{\alpha}{2}$
  • B
    $1-4 \cos ^2 \frac{\alpha}{2}$
  • C
    $-1-4 \cos ^2 \frac{\alpha}{2}$
  • D
    $-1+4 \cos ^2 \frac{\alpha}{2}$

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