જો $\theta$ એ લઘુકોણ હોય અને $2 \sin ^2 \theta = \cos ^4 \frac{\pi}{8} + \sin ^4 \frac{3 \pi}{8} + \cos ^4 \frac{5 \pi}{8} + \sin ^4 \frac{7 \pi}{8}$ હોય,તો $\theta =$

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{\pi}{8}$

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