$\sin ^2 \frac{\pi }{8} + \sin ^2 \frac{3\pi }{8} + \sin ^2 \frac{5\pi }{8} + \sin ^2 \frac{7\pi }{8} = $

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    $2$

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