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If f(x)=(a sin x+b cosx)/(c sinx+dcosx) ...

If `f(x)=(a sin x+b cosx)/(c sinx+dcosx)` is decreasing for all `x`, then

A

`ad- bclt 0`

B

`ad- bc gt 0`

C

`ab- cd gt 0`

D

`ab - cd lt 0`

Text Solution

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The correct Answer is:
A
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