$\cos \left(\frac{7 \pi}{12}\right)$ નું મૂલ્ય શું છે?

  • A
    $\frac{\sqrt{2}+\sqrt{3}}{4}$
  • B
    $\frac{\sqrt{2}-\sqrt{3}}{4}$
  • C
    $\frac{\sqrt{2}-\sqrt{6}}{4}$
  • D
    $\frac{\sqrt{6}-\sqrt{2}}{4}$

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

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