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प्रश्न
Choose the correct alternative:
x = `(1 - "t"^2)/(1 + "t"^2)`, y = `(2"t")/(1 + "t"^2)` then `("d"y)/("d"x)` is
पर्याय
`- y/x`
`y/x`
`- x/y`
`x/y`
उत्तर
`- x/y`
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