The function \( f(x)=x^{3}-6 x^{2}+9 x+3 \) is decreasing for (a) \...

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The function \( f(x)=x^{3}-6 x^{2}+9 x+3 \) is decreasing for
(a) \( 1x3 \)
(b) \( x1 \)
(c) \( x1 \)
(d) \( x1 \) or \( x3 \)
\( \mathrm{P} \)
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