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[" 77.The value of "cos(2 pi)/(7)+cos(4 ...

[" 77.The value of "cos(2 pi)/(7)+cos(4 pi)/(7)+cos(6 pi)/(7)," is "],[[" (a) "1," (b) "-1," (c) "1/2," (d) "-1/2]]

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Find the value of cos(2 pi)/(7)+cos(4 pi)/(7)+cos(6 pi)/(7)

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