x^2/(1+x)
(2x(1+x)-x^2)/(1+x)^2=(2x+2x^2-x^2)/(x+1)^2=(2x+x^2)/(x+1)^2
2x*1/(x+1)-x^2/(1+x)^2=(2x(1+x)-x^2)/(1+x)^2=(2x+x^2)/(x+1)^2
x^2/(1+x)
(2x(1+x)-x^2)/(1+x)^2=(2x+2x^2-x^2)/(x+1)^2=(2x+x^2)/(x+1)^2
2x*1/(x+1)-x^2/(1+x)^2=(2x(1+x)-x^2)/(1+x)^2=(2x+x^2)/(x+1)^2