$\cos ^4 x$ નું મૂલ્ય શું છે?

  • A
    $\frac{3}{8}+\frac{1}{2} \cos 2 x+\frac{1}{8} \cos 4 x$
  • B
    $\frac{3}{8}-\frac{1}{2} \cos 2 x+\frac{1}{8} \cos 4 x$
  • C
    $\frac{3}{8}-\frac{1}{8} \cos 4 x+\frac{1}{2} \cos 2 x$
  • D
    $\frac{1}{8} \cos 4 x+\frac{1}{2} \cos 2 x-\frac{3}{8}$

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$\cos ^4 \frac{\pi}{8}+\cos ^4 \frac{3 \pi}{8}+\cos ^4 \frac{5 \pi}{8}+\cos ^4 \frac{7 \pi}{8}=$

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