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[" Let "ABC" be a triangle such that "/_ACB=(pi)/(6)" and let "a" ,ben come them and in the many "],[[" A."B" and "C" respectively.The value(s) of "x" for which "a=x^(2)+x+1,b=x-1," and "a=2x+1],[[" (A) "-(2+sqrt(3))," (B) "1+sqrt(3)],[" (C) "2+sqrt(3)," (D) "4sqrt(3)]]]

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