જો $x^2+y^2=t+\frac{1}{t}$ અને $x^4+y^4=t^2+\frac{1}{t^2}$ હોય,તો $x^3 y \frac{dy}{dx}$ ની કિંમત શું થાય?

  • A
    $-1$
  • B
    $1$
  • C
    $0$
  • D
    $t$

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