Let the \( f: \mathbf{R} \rightarrow \mathbf{R} \) be defined by \(...

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Let the \( f: \mathbf{R} \rightarrow \mathbf{R} \) be defined by \( f(x)=2 x+\cos x \), then \( f \) :
(A) has a minimum at \( x=\pi \)
(B) has a maximum, at \( x=0 \)
P
W.
(C) is a decreasing function
(D) is an increasing function
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