$\int \frac{f'(x)}{[f(x)]^2} \, dx = $

  • A
    $- [f(x)]^{-1} + c$
  • B
    $\log |f(x)| + c$
  • C
    $e^{f(x)} + c$
  • D
    इनमें से कोई नहीं

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