2 x ------ 2 2 - x
x^2/(2 - x^2)
2 -x ------- 2 -2 + x
-x^2/(-2 + x^2)
-1 - 2/(-2 + x^2)
2 -1 - ------- 2 -2 + x
x^2/(2.0 - x^2)