The solution of \[\cos (x+y)\,dy=\,\,dx\] is [DCE 1999

1.	The solution of \[\cos (x+y)\,dy=\,\,dx\] is [DCE 1999]
A.	\[y=\tan \,\left( \frac{x+y}{2} \right)+c\]
B.	\[y+{{\cos }^{-1}}\left( \frac{y}{x} \right)=c\]
C.	\[y=x\,\,\sec \left( \frac{y}{x} \right)+c\]
D.	None of these
Answer» B. \[y+{{\cos }^{-1}}\left( \frac{y}{x} \right)=c\]

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The solution of \[\cos (x+y)\,dy=\,\,dx\] is [DCE 1999]

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