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[" If "x=y cos(2 pi)/(3)=z cos(4 pi)/(3)...

[" If "x=y cos(2 pi)/(3)=z cos(4 pi)/(3)," then "xy+yz+zx" is equal to "],[[" (a) "-1," (b) "0],[" (c) "1," (d) "2]]

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