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[" Q.12"x=y cos(2 pi)/(3)=z cos(4 pi)/(3...

[" Q.12"x=y cos(2 pi)/(3)=z cos(4 pi)/(3)" ,then "],[qquad [xy+yz+zx,=],[(A)-1," (B) "0],[" (C) "1," (D) "2]]

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