(1.0 + x^2 + x^4)/(-1.0 + x)
2 / 2\
1 + x *\1 + x /
---------------
-1 + x 2 3 3
2 + x + x + 2*x + ------
-1 + x/ 2\ / 2 \
\1 + x + x /*\1 + x - x/
-------------------------
-1 + x