6. Ed, Jin, and Faye were debating on how to integrate the following the integral: \int \frac{\ln (x)}{x} d x Ed argues that it can be evaluated using u-substitution, letting u = ln (x). Jin thinks that it can be evaluated using integration by parts, letting f(x) =1gʻ(x) = ¹.x= ln (x)- Faye claims that it can be evaluated using integration by parts, letting f(x) = 1/x ,g'(x) = ln(x). Explain why each of their approaches are valid or invalid.