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If x^y=e^(x-y),then(dy)/(dx) is equal to...

If `x^y=e^(x-y),then(dy)/(dx)` is equal to

A

`(e^x)/(x^(x-y))`

B

`1/y-1/(x-y)`

C

`(log x)/(log(x-y))`

D

`(log x)/((1+log x)^2)`.

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