જો $x^2+y^2=t+\frac{2}{t}$ અને $x^4+y^4=t^2+\frac{4}{t^2}$ હોય, તો $x^3 y \frac{d y}{d x}$ ની કિંમત શોધો.

  • A
    -$1$
  • B
    -$2$
  • C
    $\frac{y}{x}$
  • D
    $x y$

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