$\cos(18^{\circ}-A) \cos(18^{\circ}+A) - \cos(72^{\circ}-A) \cos(72^{\circ}+A)$ ની કિંમત શોધો.

  • A
    $\cos 54^{\circ}$
  • B
    $\cos 36^{\circ}$
  • C
    $\sin 54^{\circ}$
  • D
    $\sin 36^{\circ}$

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