題組內容

2. Answer the following questions:

2.5 If \( f(x) = (\ln x)^{1 / x} \) for \( x > 0 \), then \( \frac{df(x)}{dx} = \underline{\quad (5\%)} \), and \( \lim_{x\to \infty}f(x) = \underline{\quad (5\%)} \).