The interval in which \( f(x)=x^{1 / x} \) is increasing?....

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The interval in which \( f(x)=x^{1 / x} \) is increasing?
\( \mathrm{P} \)
(1) \( \left(0, \frac{1}{e}\right) \)
(2) \( (0, e) \)
(3) \( \left(\frac{1}{e}, \infty\right) \)
(4) \( (e, \infty) \)


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