4 2
x + x + 5
-----------
2
/ 2 \
\x + 1/ (5.0 + x^2 + x^4)/(1.0 + x^2)^2
2 / 2\
5 + x *\1 + x /
---------------
2
/ 2\
\1 + x / 2
-4 + x
1 - -------------
4 2
1 + x + 2*x