2 2*(2*x - 1) -------- + ----------- 2 3 (1 - x) (1 - x)
2 -2 + 4*x -------- + -------- 2 3 (1 - x) (1 - x)
2.0/(1.0 - x)^2 + 2.0*(-1.0 + 2.0*x)/(1.0 - x)^3
3 2 2*(1 - x) + (1 - x) *(-2 + 4*x) -------------------------------- 5 (1 - x)
2*x -------- 3 (1 - x)
-2*x --------- 3 (-1 + x)
-2*x -------------------- 3 2 -1 + x - 3*x + 3*x