differentiation

Question: Function $f(x)=\frac{4{{x}^{2}}+1}{x}$ is decreasing for interval



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

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