यदि $x^{2}+y^{2}=t+\frac{1}{t}$ और $x^{4}+y^{4}=t^{2}+\frac{1}{t^{2}}$ है,तो $\frac{d y}{d x}$ ज्ञात कीजिए।

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

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