$\frac{d}{d x}\left[\left(\sqrt{x}+\frac{1}{\sqrt{x}}\right)^2\right]=$ . . . . . .

  • A
    $1-\frac{1}{x^2}$
  • B
    $1+\log x$
  • C
    $1+\frac{1}{x^2}$
  • D
    $2 x-\frac{2}{x^3}$

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