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[*12.(1+cos(pi)/(8))(1+cos(3 pi)/(8))(1+...

[*12.(1+cos(pi)/(8))(1+cos(3 pi)/(8))(1+cos(5 pi)/(8))(1+cos(7 pi)/(8))],[[" (A) "(1)/(2)," (B) "(1)/(4)],[" (C) "(1)/(8)," (D) "(1)/(16)]]

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(1+cos.(pi)/(8))(1+cos.(3pi)/(8))(1+cos.(5pi)/(8))(1+cos.(7pi)/(8)) is equal to

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(1 + cos"" (pi)/(8))(1 + cos"" (3pi)/(8)) (1 + cos"" (5pi)/(8))(1 + cos"" (7pi)/(8)) =