$(1+\cos \frac{\pi}{6})(1+\cos \frac{\pi}{3})(1+\cos \frac{2\pi}{3})(1+\cos \frac{7\pi}{6})$ का मान है

  • A
    $\frac{3}{16}$
  • B
    $\frac{3}{8}$
  • C
    $\frac{3}{4}$
  • D
    $\frac{1}{2}$

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