If \[\cos (x+y)=y\sin x,\]then \[\frac{dy}{dx}=\] [AI CBSE 1979]

\[\frac{\sin (x+y)+y\cos x}{\sin x+\sin (x+y)}\]

\[-\frac{\sin (x+y)+y\cos x}{\sin x+\sin x+y)}\]

If \[\cos (x+y)=y\sin x,\]then \[\frac{dy}{dx}=\]

1.	If \[\cos (x+y)=y\sin x,\]then \[\frac{dy}{dx}=\] [AI CBSE 1979]
A.	\[-\frac{\sin (x+y)+y\cos x}{\sin x+\sin x+y)}\]
B.	\[\frac{\sin (x+y)+y\cos x}{\sin x+\sin (x+y)}\]
C.	\[-\frac{\sin (x+y)+y\cos x}{\sin x+\sin x+y)}\]
D.	None of these
Answer» B. \[\frac{\sin (x+y)+y\cos x}{\sin x+\sin (x+y)}\]

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If \[\cos (x+y)=y\sin x,\]then \[\frac{dy}{dx}=\] [AI CBSE 1979]

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