The function \[\frac{a\sin x+b\cos x}{c\sin x+d\,\cos x}\] is decreasing, if [RPET 1999]

The function \[\frac{a\sin x+b\cos x}{c\sin x+d\,\cos x}\] is decreasi

1.	The function \[\frac{a\sin x+b\cos x}{c\sin x+d\,\cos x}\] is decreasing, if [RPET 1999]
A.	\[ad-bc>0\]
B.	\[ad-bc<0\]
C.	\[ab-cd>0\]
D.	\[ab-cd<0\]
Answer» C. \[ab-cd>0\]

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The function \[\frac{a\sin x+b\cos x}{c\sin x+d\,\cos x}\] is decreasing, if [RPET 1999]

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