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Function f(x) = (lambda sin x + 6 cos x)...

Function `f(x) = (lambda sin x + 6 cos x)/(2 sin x + 3 cos x)` is monotonic increasing if

A

`lambda gt 1`

B

`lambda lt 1`

C

`lambda lt 4`

D

`lambda gt 4`

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The correct Answer is:
D
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