$\left(1+\cos \frac{\pi}{8}\right)\left(1+\cos \frac{3 \pi}{8}\right)\left(1+\cos \frac{5 \pi}{8}\right)\left(1+\cos \frac{7 \pi}{8}\right)$ का मान है

  • A
    $\frac{1}{8}$
  • B
    $\frac{-1}{8}$
  • C
    $\frac{1}{16}$
  • D
    $\frac{-1}{16}$

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