/ 2 \ x*(x - 1)*(x - 1) - (x - 2)*\x + 2*x + 4/
2 / 2 \ x*(-1 + x) - (-2 + x)*\4 + x + 2*x/
x*(-1.0 + x)^2 - (-2.0 + x)*(4.0 + x^2 + 2.0*x)
2 x*(-1 + x) - (-2 + x)*(4 + x*(2 + x))
2 8 + x - 2*x