(x^3-4*x^2+x+6)/(4-x^2)=-(x^3-4*x^2+x+6)/(x^2-4)=-((x^2-2x-3)(x-2))/((x-2)(x+2))=-(x^2-2x-3)/(x+2)
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(x^3-4*x^2+x+6)/(4-x^2)=-(x^3-4*x^2+x+6)/(x^2-4)=-((x^2-2x-3)(x-2))/((x-2)(x+2))=-(x^2-2x-3)/(x+2)