यदि $y^m + y^{-m} = 2x$ है, तो $(x^2 - 1) \left( \frac{dy}{dx} \right)^2 = $

  • A
    $m^2 y^2$
  • B
    $m y^2$
  • C
    $m^2 y$
  • D
    $m y$

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