The function \( f(x)=\frac{\lambda \sin x+2 \cos x}{\sin x+\cos x} \) is increasing, if (a) \( \...

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The function \( f(x)=\frac{\lambda \sin x+2 \cos x}{\sin x+\cos x} \) is increasing, if
(a) \( \lambda1 \)
(b) \( \lambda1 \)
(c) \( \lambda2 \)
(d) \( \lambda2 \)
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