Answer
$$y'=\frac{1}{3}\Big(\frac{x(x-2)}{x^2+1}\Big)^{1/3}\Big(\frac{1}{x}+\frac{1}{x-2}-\frac{2x}{x^2+1}\Big)$$
Work Step by Step
$$y=\sqrt[3]{\frac{x(x-2)}{x^2+1}}=\Big(\frac{x(x-2)}{x^2+1}\Big)^{1/3}$$
We have $$y'=\Big(\Big(\frac{x(x-2)}{x^2+1}\Big)^{1/3}\Big)'=\frac{1}{3}\Big(\frac{x(x-2)}{x^2+1}\Big)^{-2/3}\Big(\frac{x(x-2)}{x^2+1}\Big)'$$ $$y'=\frac{1}{3}\Big(\frac{x(x-2)}{x^2+1}\Big)^{-2/3}\times (N)'$$
Consider $N$: $$N=\frac{x(x-2)}{x^2+1}$$
1) Take the natural logarithm of both sides and simplify:
$$\ln N=\ln\Big(\frac{x(x-2)}{x^2+1}\Big)$$
Recall that $\ln(A/B)=\ln A-\ln B$ and $\ln(A\times B)=\ln A+\ln B$: $$\ln N=\ln x(x-2)-\ln (x^2+1)$$ $$\ln N =\ln x+\ln(x-2)-\ln(x^2+1)$$
2) Then we take the derivative of both sides with respect to $x$ and remember that $(\ln x)'=1/x$:
$$\frac{1}{N}\times (N)'=\frac{1}{x}+\frac{1}{x-2}-\frac{1}{x^2+1}(x^2+1)'$$ $$\frac{N'}{N}=\frac{1}{x}+\frac{1}{x-2}-\frac{2x}{x^2+1}$$
3) Solve for $N'$: $$N'=\Big(\frac{1}{x}+\frac{1}{x-2}-\frac{2x}{x^2+1}\Big)\times N$$
4) Substitute for $N=\frac{x(x-2)}{x^2+1}$
$$N'=\Big(\frac{1}{x}+\frac{1}{x-2}-\frac{2x}{x^2+1}\Big)\frac{x(x-2)}{x^2+1}$$
5) Finally, substitute $N'$ back to $y'$: $$y'=\frac{1}{3}\Big(\frac{x(x-2)}{x^2+1}\Big)^{-2/3}\frac{x(x-2)}{x^2+1}\Big(\frac{1}{x}+\frac{1}{x-2}-\frac{2x}{x^2+1}\Big)$$ $$y'=\frac{1}{3}\Big(\frac{x(x-2)}{x^2+1}\Big)^{1/3}\Big(\frac{1}{x}+\frac{1}{x-2}-\frac{2x}{x^2+1}\Big)$$
