यदि $\int \frac{e^x-1}{e^x+1} dx = f(x) + c$ है, तो $f(x)$ का मान ज्ञात कीजिए।

  • A
    $2 \log (e^x + 1)$
  • B
    $\log (e^{2x} - 1)$
  • C
    $2 \log (e^x + 1) - x$
  • D
    $\log (e^{2x} + 1)$

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