Find the derivative: $\frac{d}{dx} \left[ \log \left( x + \frac{1}{x} \right) \right] = $

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

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