The function f(x)=(asinx+b cosx)/(c sinx...

The function `f(x)=(asinx+b cosx)/(c sinx+d cos x)` is decreasing, if

A

`ad - bc gt 0`

B

`ad - bc lt 0`

C

`ab-cd gt 0`

D

`ab-cd lt 0`

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The correct Answer is:

B

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