3 a + 27 ------------ 4 a - 3*a + 9
(27.0 + a^3)/(9.0 + a^4 - 3.0*a)
3 27 + a --------------- / 3\ 9 + a*\-3 + a /
/ 2 \ (3 + a)*\9 + a - 3*a/ ---------------------- 4 9 + a - 3*a