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=(x-√3)(x-√3)-2(x-√3) (x+√3)+(x+√3)(x+√3)=
=x²-x√3-x√3+√3×√3-2(x²+x√3-x√3-√3×√3)+x²+x√3+x√3+√3×√3=
=x²-x√3-x√3+√9-2x²-2x√3+2x√3+6+x²+x√3+x√3+√9=
=3+6+3=
=12