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प्रश्न
If x2 + y2 = t + `1/"t"` and x4 + y4 = t2 + `1/"t"^2` then `("d"y)/("d"x)` = ______
पर्याय
`x/(2y)`
`(-y)/x`
`(-x)/(2y)`
`y/x`
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उत्तर
`(-y)/x`
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