If $f(x) = \frac{\log x}{x}$ $(x > 0)$,then it is increasing in

  • A
    $(0, e)$
  • B
    $(e, \infty)$
  • C
    $(0, \infty)$
  • D
    $(-\infty, \infty)$

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Let $f(x) = \frac{x}{\sqrt{a^2+x^2}} - \frac{d-x}{\sqrt{b^2+(d-x)^2}}$,$x \in R$,where $a, b, d$ are non-zero real constants. Then

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