\[ \text { If } x^{2}+y^{2}=t-\frac{1}{t} \text { and } x^{4}+y^{4}=t^{2}+\frac{1}{t^{2}} \text ...

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\[
\text { If } x^{2}+y^{2}=t-\frac{1}{t} \text { and } x^{4}+y^{4}=t^{2}+\frac{1}{t^{2}} \text { then } x^{3} y \frac{d y}{d x}=
\]
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