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cos^(3)(pi)/(8)+cos^(3)(3 pi)/(8)+cos^(3...

cos^(3)(pi)/(8)+cos^(3)(3 pi)/(8)+cos^(3)(5 pi)/(8)+cos^(3)(7 pi)/(8)=0

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cos ((pi) / (8)) cos ((3 pi) / (8)) cos ((5 pi) / (8)) cos ((7 pi) / (8)) =