$\int \frac{dx}{\sqrt{e^x-1}} = 2 \tan^{-1}(f(x)) + c$,जहाँ $x > 0$ और $c$ समाकलन का एक स्थिरांक है,तो $f(x)$ है

  • A
    $e^x-1$
  • B
    $\sqrt{e^x-1}$
  • C
    $e^x+1$
  • D
    $\sqrt{e^x+1}$

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