$\cos 15^{\circ} - \sin 15^{\circ}$ ની કિંમત ...... છે.

  • A
    $\sqrt{2}$
  • B
    $-\sqrt{2}$
  • C
    $\frac{1}{\sqrt{2}}$
  • D
    $-\frac{1}{\sqrt{2}}$

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