1 + x ------ 2 4 - x
(1 + x)/(4 - x^2)
-3/(4*(-2 + x)) - 1/(4*(2 + x))
3 1 - ---------- - --------- 4*(-2 + x) 4*(2 + x)
-(1 + x) --------- 2 -4 + x
-(1 + x)/(-4 + x^2)
(1.0 + x)/(4.0 - x^2)
-(1 + x) ---------------- (-2 + x)*(2 + x)
-(1 + x)/((-2 + x)*(2 + x))