/ 3\ | -4 + x | 6*|-1 + -------| | 3 | \ x / ---------------- x
/ 3\ 6*\-4 + x / -6 + ----------- 3 x ---------------- x
3 -24 + 6*x -6 + ---------- 3 x --------------- x
6.0*(-1.0 + (-4.0 + x^3)/x^3)/x
/ 3\ 6*\-4 + x / -6 + ----------- 3 x ---------------- x