$\cos(60^{\circ} - A) \cdot \cos A \cdot \cos(60^{\circ} + A)$ નું મૂલ્ય છે

  • A
    $\frac{1}{4} \cos 3A$
  • B
    $\sin 3A$
  • C
    $\cos 3A$
  • D
    $\frac{1}{4} \sin 3A$

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$\frac{2}{\sqrt{2+\sqrt{2+\sqrt{2+2 \cos 4x}}}}$ નું સાદું રૂપ શું છે?

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