જો $x = \frac{9t^2}{1+t^4}$ અને $y = \frac{16t^2}{1-t^4}$ હોય, તો $\frac{dy}{dx} = $

  • A
    $\frac{16}{9}\left(\frac{1-t^4}{1+t^4}\right)^3$
  • B
    $\frac{16(1-t^4)}{9(1+t^4)}$
  • C
    $\frac{9(1-t^4)}{16(1+t^4)}$
  • D
    $\frac{16}{9}\left(\frac{1+t^4}{1-t^4}\right)^3$

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