यदि $\sqrt{y + x} + \sqrt{y - x} = c$ और $\frac{dy}{dx} = K - \sqrt{\frac{y^2}{x^2} - 1}$ है, तो $K$ का मान है

  • A
    $-\frac{x}{y}$
  • B
    $-\frac{y}{x}$
  • C
    $\frac{x}{y}$
  • D
    $\frac{y}{x}$

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