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

  • A
    $\frac{a(t^2+1)}{2t}$
  • B
    $\frac{a(t^2-1)}{t}$
  • C
    $\frac{a(1-t^2)}{2t}$
  • D
    $\frac{a(t^2-1)}{2t}$

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