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[" 51.The value of "],[qquad [cos(pi)/(1...

[" 51.The value of "],[qquad [cos(pi)/(15)cos(2 pi)/(15)cos(3 pi)/(15)cos(4 pi)/(15)cos(5 pi)/(15)cos(6 pi)/(15)cos(7 pi)/(15)" is "],[[" (a) "(1)/(2^(6))," (b) "(1)/(2^(7))," (c) "(1)/(2^(8))," (d) none of these "]]]

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