/ 2\ |x x | |x|*|- + --| \2 2 / ------------ x + 1
(|x|*(x/2 + x^2/2))/(x + 1)
x*|x| ----- 2
x*|x|/2
(0.5*x + 0.5*x^2)*|x|/(1.0 + x)
/ 2\ \x + x /*|x| ------------ 2 + 2*x
(x + x^2)*|x|/(2 + 2*x)