The solution of the differential equation $x(e^{2y} - 1)dy + (x^2 - 1)e^y dx = 0$ is

  • A
    $e^y + e^{-y} = \log x - \frac{x^2}{2} + c$
  • B
    $e^y - e^{-y} = \log x - \frac{x^2}{2} + c$
  • C
    $e^y + e^{-y} = \log x + \frac{x^2}{2} + c$
  • D
    None of these

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