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

1.	Solution of \[(xy\cos xy+\sin xy)dx+{{x}^{2}}\cos xy\,dy=0\] is
A.	\[x\sin (xy)=k\]
B.	\[xy\sin (xy)=k\]
C.	\[\frac{x}{y}\sin (xy)=k\]
D.	\[x\sin (xy)=k\]
Answer» B. \[xy\sin (xy)=k\]

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

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