$\frac{d}{dx} \left\{ \log \left( \frac{e^x}{1 + e^x} \right) \right\} = $

  • A
    $\frac{1}{1 - e^x}$
  • B
    $-\frac{1}{1 + e^x}$
  • C
    $-\frac{1}{1 - e^x}$
  • D
    इनमें से कोई नहीं

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