12.0 + x^2 + 2.0/x^2 + 12.0/x^3 - 15.0*x
6 3 5 2 / 4 3 3 / 2 \\ - 2*x + 2*x + 4*x + x *\12 + 3*x + 8*x + x *\x - 16*x// ------------------------------------------------------------- 5 x
4 3 4 12 + x + 2*x + 12*x + x *(-16 + x) ------------------------------------ 3 x