The exact value of \(\sin ^6 \frac{\pi}{16}+\sin ^6 \frac{3 \pi}{16}\)\(\sin ^6 \frac{5 \pi}{16}+\sin ^6 \frac{7 \pi}{16}\) is

1
1
2
\(\frac{3}{4}\)
3
\(\frac{5}{4}\)
4
\(1+\frac{1}{8 \sqrt{2}}\)

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