Find the derivative of f(x)=x/(x2+1)f(x) = x / (x^2+1)f(x)=x/(x2+1).
1−x2(x2+1)2\frac{1-x^2}{(x^2+1)^2}(x2+1)21−x2
1/(2x)1 / (2x)1/(2x)
(x2−1)/(x2+1)2(x^2-1) / (x^2+1)^2(x2−1)/(x2+1)2
None