Integrate by parts. First rewrite the integral in the form udv/dx, which is (1)ln(x). Then integrate (1)ln(x) wrt dx by assigning u=ln(x) du/dx=1/x and dv/dx=1 v=x. We can determine the integral of ln(x), using the following formula for integration by parts: integral of udv/dx wrt x = (uv) − (integral of vdu/dx wrt x ).