Function \( f(x)=\frac{\lambda \sin x+6 \cos x}{2 \sin x+3 \cos x} ...

Function \( f(x)=\frac{\lambda \sin x+6 \cos x}{2 \sin x+3 \cos x} \) is monotonic
P increasing, if

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(a) \( \lambda1 \)
(b) \( \lambda1 \)
(c) \( \lambda4 \)
(d) \( \lambda4 \)