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[" The value of "cos(2 pi)/(15)cos(4 pi)...

[" The value of "cos(2 pi)/(15)cos(4 pi)/(15)cos(8 pi)/(15)cos(14 pi)/(15)," is "],[[" (a) "1," (b) "1/2," (c) "1/4," (d) "1/16]]

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