समाकलन ज्ञात कीजिए: $\int \frac{dx}{e^x + e^{-x}} = $ . . . . . . $+ C$.

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

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