/ 3 3\ \8*a - 27*b /*b ---------------- 2*a - 3
b*(8.0*a^3 - 27.0*b^3)/(-3.0 + 2.0*a)
4 -27*b + 27*b 2 9*b - ------------- + 4*b*a + 6*a*b -3 + 2*a
/ 2 2 \ b*(-3*b + 2*a)*\4*a + 9*b + 6*a*b/ ------------------------------------ -3 + 2*a