differentiation

Question: If $f(x)={{x}^{3}}-6{{x}^{2}}+9x+3$ be a decreasing function, then x lies in



1) $(-\infty ,-1)\cap (3,\,\infty )$
2) $(1,\,\,3)$
3) $(3,\,\,\infty )$
4) None of these
Solution: Explanation: No Explanation
Increasing and Decreasing function

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