1.

If \[3\sin (xy)+4\cos (xy)=5\], then \[\frac{dy}{dx}=\] [EAMCET 1994]

A.            \[-\frac{y}{x}\]
B.            \[\frac{3\sin (xy)+4\cos (xy)}{3\cos (xy)-4\sin (xy)}\]
C.            \[\frac{3\cos (xy)+4\sin (xy)}{4\cos (xy)-3\sin (xy)}\]
D.             None of these
Answer» B.            \[\frac{3\sin (xy)+4\cos (xy)}{3\cos (xy)-4\sin (xy)}\]


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