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Determine the interval in which the func...

Determine the interval in which the function f(x) = `x^3-5x^2+3x+97` is decreasing and that in which it is increasing.

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The correct Answer is:
`implies` f(x) is decreasing in [`1/3`, 3] and increasing in `(-infty,1/3]uu[3,infty)`.
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