જો $x^2+y^2=t+\frac{1}{t}$ અને $x^4+y^4=t^2+\frac{1}{t^2}$ હોય,તો $\frac{dy}{dx}$ ની કિંમત શોધો.

  • A
    $-\frac{x}{y}$
  • B
    $-\frac{y}{x}$
  • C
    $-\frac{x^2}{y^2}$
  • D
    $-\frac{y^2}{x^2}$

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