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
    $1/(x{y^3})$
  • B
    $1/({x^3}y)$
  • C
    $-1/({x^3}y)$
  • D
    $-1/(x{y^3})$

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