still having problems with integrals. i'm stumped on how to get the four substitutions. here's the problem

evaluate the integral.

$\displaystyle

\int_1^2 \frac{(lnx)^2dx}{x^3}

$

just getting $\displaystyle f\prime(x), f(x), g\prime(x) and g(x) $ would be a great help. thank you