If \[{{x}^{y}}.{{y}^{x}}=1\], then \[\frac{dy}{dx}\]=

1.	If \[{{x}^{y}}.{{y}^{x}}=1\], then \[\frac{dy}{dx}\]=
A.	\[\frac{y\,(y+x\log y)}{x(y\log x+x)}\]
B.	\[\frac{y\,(x+y\log x)}{x(y+x\log y)}\]
C.	\[-\frac{y(y+x\log y)}{x(x+y\log x)}\]
D.	None of these
Answer» D. None of these

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If \[{{x}^{y}}.{{y}^{x}}=1\], then \[\frac{dy}{dx}\]=

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