Answer:
(ln x)² + C
Step-by-step explanation:
ln x dx
∫ -------------
x 1
responds well to the substitution u = ln x. Then du/dx = -----
dx x
or du = -------
x
dx
Back to the original integral: substitute du for -------
x
and u for ln x:
∫udu
This integrates to u² + C.
Finally, replace this u with ln x: (ln x)² + C (indefinite integral)