यदि ${x^2} + {y^2} = t - \frac{1}{t}$ और ${x^4} + {y^4} = {t^2} + \frac{1}{t^2}$ है,तो ${x^3}y\frac{dy}{dx} = $

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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