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Find the intervals in which f(x)=(4x^2+1...

Find the intervals in which `f(x)=(4x^2+1)/x` is increasing or decreasing.

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Given,`f (x) = [4x^2 + 1] / x`
`f’ (x) = 4 – (1 / x^2)`
f (x) will be decreasing if f’ (x) < 0
`4 – (1 / x^2) < 0`
...
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