The function \( f(x)=4-3 x+3 x^{2}-x^{3} \) is (a) decreasing on \(...

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The function \( f(x)=4-3 x+3 x^{2}-x^{3} \) is
(a) decreasing on \( R \)
(b) increasing on \( R \)
\( \mathrm{P} \)
(c) strictly decreasing on \( R \)
(d) strictly increasing on \( R \)
W)
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