If $y = \frac{K^{\cos^{-1} x}}{1 + K^{\cos^{-1} x}}$ and $t = K^{\cos^{-1} x}$,then find $\frac{dy}{dt}$.

  • A
    $\frac{1}{1 + K^{\cos^{-1} x}}$
  • B
    $\frac{-1}{1 + K^{\cos^{-1} x}}$
  • C
    $\frac{1}{(1 + K^{\cos^{-1} x})^2}$
  • D
    $\frac{-1}{(1 + K^{\cos^{-1} x})^2}$

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