2*x + 1 ----------------- (x + 1)*(2*x + 3)
(2*x + 1)/(((x + 1)*(2*x + 3)))
-1/(1 + x) + 4/(3 + 2*x)
1 4 - ----- + ------- 1 + x 3 + 2*x
(1.0 + 2.0*x)/((1.0 + x)*(3.0 + 2.0*x))
(1.0 + 2.0*x)/((1.0 + x)*(3.0 + 2.0*x))
1 + 2*x -------------- 2 3 + 2*x + 5*x
(1 + 2*x)/(3 + 2*x^2 + 5*x)