यदि $y = \sqrt{\frac{1 + e^x}{1 - e^x}}$ है,तो $\frac{dy}{dx} = $

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

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