## Calculus (3rd Edition)

$$G'(s) =\frac{2\ln s}{s}.$$
Recall that $(\ln x)'=\dfrac{1}{x}$ Since $G(s)=(\ln(s))^2$, then the derivative, using the chain rule, is given by $$G'(s)=2(\ln(s))(\ln s)'=\frac{2\ln s}{s}.$$