The solution of \[(1+xy)y\,dx+(1-xy)x\,dy=0\] is

1.	The solution of \[(1+xy)y\,dx+(1-xy)x\,dy=0\] is
A.	\[\frac{x}{y}+\frac{1}{xy}=k\]
B.	\[\log \left( \frac{x}{y} \right)=\frac{1}{xy}+k\]
C.	\[\frac{x}{y}+\frac{1}{xy}=k\]
D.	\[\log \left( \frac{x}{y} \right)=xy+k\]
Answer» C. \[\frac{x}{y}+\frac{1}{xy}=k\]

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The solution of \[(1+xy)y\,dx+(1-xy)x\,dy=0\] is

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