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| 1. |
\begin{array}{l}{\text { Show that: }} \\ {\sin ^{2} \frac{\pi}{8}+\sin ^{2} \frac{3 \pi}{8}+\sin ^{2} \frac{5 \pi}{8}+\sin ^{2} \frac{7 \pi}{8}=2}\end{array} |
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