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[" 92.If "x^(a)y^(b)=(x-y)^(a+b)" ,then ...

[" 92.If "x^(a)y^(b)=(x-y)^(a+b)" ,then the value of "(dy)/(dx)-(y)/(x)" is "],[" equal to "],[[" (a) "(a)/(b)," (b) "(b)/(a)," (c) "1," (d) "0]]

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