2 x ------ 2 x - 4
x^2/(x^2 - 4)
1 + 1/(-2 + x) - 1/(2 + x)
1 1 1 + ------ - ----- -2 + x 2 + x
4 1 + ------- 2 -4 + x
1 + 4/(-4 + x^2)
x^2/(-4.0 + x^2)
2 x ---------------- (-2 + x)*(2 + x)
x^2/((-2 + x)*(2 + x))