diff-equation

Question: Solution of $(xy\cos xy+\sin xy)dx+{{x}^{2}}\cos xy\,dy=0$ is



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

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