यदि $y = \sec(\tan^{-1}x)$ है,तो $\frac{dy}{dx}$ है

  • A
    $\frac{x}{\sqrt{1 + x^2}}$
  • B
    $\frac{-x}{\sqrt{1 + x^2}}$
  • C
    $\frac{x}{\sqrt{1 - x^2}}$
  • D
    इनमें से कोई नहीं

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