2 a a + 6 ----- - ---------- a + 2 2 a - a - 6
2 a -6 - a ----- + ----------- 2 + a 2 -6 + a - a
a/(2.0 + a) - (6.0 + a^2)/(-6.0 + a^2 - a)
/ 2 \ / 2\ a*\-6 + a - a/ + \-6 - a /*(2 + a) ----------------------------------- / 2 \ (2 + a)*\-6 + a - a/
/ 2\ a*(-6 + a*(-1 + a)) - (2 + a)*\6 + a / -------------------------------------- (-6 + a*(-1 + a))*(2 + a)