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Find the intervals in which the function...

Find the intervals in which the function `f(x)=6+12x+3x^(2)-2x^(3)` is strictly increasing and srictly decreasing.

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The correct Answer is:
In in (-1, 2), dec in `(-oo,-1)uu(2,oo)`
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Find the intervals in which the function f(x) = 6 + 12x + 3x^2 - 2x^3 is strictly decreasing

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