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[sin^(2)((pi)/(8))+sin^(2)((3 pi)/(8))+s...

[sin^(2)((pi)/(8))+sin^(2)((3 pi)/(8))+sin^(2)((5 pi)/(8))+sin^(2)((7 pi)/(8))=...],[" (A) "1],[[" (C) "-1," (B) "2],[" (D) "0]]

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sin^(2)((pi)/(8))+sin^(2)((3pi)/(8))+sin^(2)((5pi)/(8))+sin^(2)((7pi)/(8))= .........

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