$\cos ^2\left(\frac{\pi}{6}+\theta\right)-\sin ^2\left(\frac{\pi}{6}-\theta\right)$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{2} \cos 2 \theta$
  • B
    $0$
  • C
    $-\frac{1}{2} \cos 2 \theta$
  • D
    $\frac{1}{2}$

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