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If f(x)=x^3+3x^2-9x+4 is a real function...

If `f(x)=x^3+3x^2-9x+4` is a real function
Find the intervals in which the fuction is increasing or decreasing.

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MAXIMUM PUBLICATION-APPLICATION OF DERIVATIVES-EXAMPLE
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  11. Find the local minimum and local maximum value, if any, of the functio...

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