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x³-1/2x²+4x-2=x²(x-1/2)+4(x-1/2)=(x-1/2)(x²+4)
-12x³+4x²+9x-3=-4x²(3x-1)+3(3x-1)=(3x-1)(3-4x²)=
(3x-1)(√3-2x)(√3+2x)