differentiation

Question: If ${x^y} = {e^{x - y}}$, then $\frac{{dy}}{{dx}} = $

1) $\log x.{[\log (ex)]^{ - 2}}$

2) $\log x.{[\log (ex)]^2}$

3) $\log x.{(\log x)^2}$

4) None of these

Solution:

Explanation: Explanation

Implicit-function

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