1 2 -- + x - - 2 x x
1 2 x + -- - - 2 x x
x + x^(-2) - 2.0/x
2 / 3\ - 2*x + x*\1 + x / ------------------- 3 x
3 1 + x - 2*x ------------ 2 x
/ 2\ (-1 + x)*\-1 + x + x / ---------------------- 2 x
-1 + 2*x x - -------- 2 x