If the function \( f(x)=\frac{K \sin x+2 \cos x}{\sin x+\cos x} \) ...

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If the function \( f(x)=\frac{K \sin x+2 \cos x}{\sin x+\cos x} \) is strictly
P increasing for all values of \( x \), then
(1) \( K1 \)
(2) \( K1 \)
(3) \( K2 \)
(4) \( K2 \)
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