Find the interval in which \( f(x)=2 x^{3}-9 x^{2}+12 x+29 \) \( \m...

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Find the interval in which \( f(x)=2 x^{3}-9 x^{2}+12 x+29 \)
\( \mathrm{P} \)
is monotonically decreasing function.
W
(1) \( x \in(1,2) \)
(2) \( x1 \)
(3) \( x2 \)
(4) None of these
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