$\cos^2 \frac{\pi}{12} + \cos^2 \frac{\pi}{4} + \cos^2 \frac{5\pi}{12}$ का मान ज्ञात कीजिए।

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

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