જો $\int \frac{dx}{e^x + 4e^{-x}} = f(x) + c$ હોય,તો $f(x)$ શું છે?

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

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