$\cos ^{2} 45^{\circ}-\sin ^{2} 15^{\circ}$ का मान क्या है?

  • A
    $\frac{\sqrt{3}}{2}$
  • B
    $\frac{\sqrt{3}}{4}$
  • C
    $\frac{\sqrt{3}+1}{2 \sqrt{2}}$
  • D
    $\frac{\sqrt{3}-1}{2 \sqrt{2}}$

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