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If x^2+y^2=t-1/t and x^4+y^4=t^2+1/t^2, ...

If `x^2+y^2=t-1/t and x^4+y^4=t^2+1/t^2,` then `x^3y (dy)/(dx)=`
(a) `0` (b) `1`(c) `-1` (d) none of these

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