यदि $\sin 18^{\circ} = \frac{\sqrt{5}-1}{4}$ है,तो $\cos ^2 48^{\circ} - \sin ^2 12^{\circ}$ का मान क्या है?

  • A
    $\frac{-\sqrt{5}+1}{8}$
  • B
    $\frac{\sqrt{5}-1}{8}$
  • C
    $\frac{\sqrt{5}+1}{8}$
  • D
    $\frac{-1-\sqrt{5}}{8}$

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