differentiation

Question: The interval of the decreasing function $f(x)={{x}^{3}}-{{x}^{2}}-x-4$is



1) $\left( \frac{1}{3},\,1 \right)$
2) $\left( -\frac{1}{3},1 \right)$
3) $\left( -\frac{1}{3},\,\frac{1}{3} \right)$
4) $\left( -1,-\frac{1}{3} \right)$
Solution: Explanation: No Explanation
Increasing and Decreasing function

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