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If x^y=2^(x-y), then dy/dx is...

If `x^y=2^(x-y)`, then `dy/dx` is

A

`(ylog2)/(xlog(2x))`

B

`y/(xlog(2x)`

C

`(xlog2-y)/(xlog2x)`

D

`(xlog2+y)/(xlog2x)`

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