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## Homework Statement

Here is a question I'm struggling with. I encountered it in a paper, and although a solution is provided I'm not so sure I understand where they're coming from.

## Homework Equations

[tex]\int_{r_1}^{r_2} \overline{v}\frac{1}{r}\frac{d}{dr}(r\frac{du}{dr})rdr[/tex]

where [tex]\overline{v}[/tex] is the conjugate of [tex]v[/tex]

## The Attempt at a Solution

I tried using the traditional integration by parts learned in undergraduate calculus courses, but I'm not getting anything close to the solution.

Any help getting started would be appreciated.