diff-equation

Question: The solution of $(1+xy)y\,dx+(1-xy)x\,dy=0$ is



1) $\frac{x}{y}+\frac{1}{xy}=k$
2) $\log \left( \frac{x}{y} \right)=\frac{1}{xy}+k$
3) $\frac{x}{y}+\frac{1}{xy}=k$
4) $\log \left( \frac{x}{y} \right)=xy+k$
Solution: Explanation: No Explanation
Exact differential equations

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