જો $x = \sec \theta - \cos \theta$ અને $y = \sec^n \theta - \cos^n \theta$ હોય,તો $(x^2 + 4) \left(\frac{dy}{dx}\right)^2 =$

  • A
    $n(y + 4)$
  • B
    $n^2(y^2 + 4)$
  • C
    $n(y + 2)$
  • D
    $n^2(y^2 + 2)$

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