2 2 3 x - x*y y 2*a --------*--*----- 4*y x x - y
/ 2 \ 3 |x x*y| 2*y*a *|-- - ---| \4 4 / ----------------- x*(x - y)
3 / 2 \ y*a *\x - x*y/ --------------- 2*x*(x - y)
0.5*y*a^3*(x^2 - x*y)/(x*(x - y))
3 / 2 \ y*a *\x - x*y/ --------------- 2*x*(x - y)
3 / 2 \ y*a *\x - x*y/ --------------- 2*x*(x - y)