$\cos 15^{\circ} - \sin 15^{\circ}$ નું મૂલ્ય શું છે?

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

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