int (In x)^2/x dx
\(\int\;\frac{(lnx)^2}{x}\;dx\\ \qquad Let\;\;u=lnx\\ \qquad \frac{du}{dx}=\frac{1}{x}\\ =\int\;u^2\frac{du}{dx}\;dx\\ =\int\;u^2\;du\\ =\frac{u^3}{3}+c\\ =\frac{(lnx)^3}{3}+c\\ \)
