यदि $y = \frac{a^{\cos^{-1}x}}{1 + a^{\cos^{-1}x}}$ और $z = a^{\cos^{-1}x}$ है,तो $\frac{dy}{dz} = $

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

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