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[" The value of "],[(1+cos(pi)/(6))(1+co...

[" The value of "],[(1+cos(pi)/(6))(1+cos(pi)/(3))(1+cos(2 pi)/(3))(1+cos(7 pi)/(6))" is "],[[" (a) "(3)/(16)," (b) "(3)/(8)," (c) "(3)/(4)," (d) "(1)/(2)]]

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