यदि $x=\sec \theta-\cos \theta$ और $y=\sec ^n \theta-\cos ^n \theta$ है,तो $\frac{d y}{d x}=$

  • A
    $\sqrt{\frac{y^2+4}{x^2+4}}$
  • B
    $n\sqrt{\frac{y^2+4}{x^2+4}}$
  • C
    $\sqrt{\frac{x^2+4}{y^2+4}}$
  • D
    $n \sqrt{\frac{x^2+4}{y^2+4}}$

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