y = (x^3 - 2x^2 + 3)^2 = x^6 - 4 x^5 + 4 x^4 + 6 x^3 - 12 x^2 + 9
y' = 6x^5 -20x^4 + 16x^3 +18x^2 - 24x
y'(-1) = -6 -20 -16 +18
y'(-1) = -24
y = (x+2)^2/(1-2x)^2
(x+2)^2/(1-2x)^2 = (x^2 + 4x + 4)/(1 - 4x + 4x^2)
y' = ((2x +4)*(1 - 4x + 4x^2) - (x^2 + 4x + 4)*(8x -4))/((1 - 4x + 4x^2)^2 = (-10 x - 20)/(8 x^3 - 12 x^2 + 6 x - 1)