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[" Q."18],[sin^(4)(pi)/(8)+sin^(4)(3 pi)...

[" Q."18],[sin^(4)(pi)/(8)+sin^(4)(3 pi)/(8)+sin^(4)(5 pi)/(8)+sin^(4)(7 pi)/(8)=]

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Prove that: sin^(4)((pi)/(8))+sin^(4)((3 pi)/(8))+sin^(4)((5 pi)/(8))+sin^(4)((7 pi)/(8))=(3)/(2)

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