x + 1 ------------ 2 x - 2*x + 5
(x + 1)/(x^2 - 2*x + 5)
1 + x ------------ 2 5 + x - 2*x
(1 + x)/(5 + x^2 - 2*x)
(1.0 + x)/(5.0 + x^2 - 2.0*x)
1 + x -------------- 5 + x*(-2 + x)
(1 + x)/(5 + x*(-2 + x))