The function \( f(x)=3 x+\cos 3 x \) is (a) increasing on \( R \) (...

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The function \( f(x)=3 x+\cos 3 x \) is
(a) increasing on \( R \)
(b) decreasing on \( R \)
\( \mathrm{P} \)
(c) strictly increasing on \( R \)
(d) strictly decreasing on \( R \)
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