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1) Find the intervals on which f is increasing and the intervals on which it is...

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Basic Math

1) Find the intervals on which f is increasing and the intervalson which it is decreasing. f(x)= -x^3-6x

2) Find the intervals on which f is increasing and the intervalson which it is decreasing. f(x)= x^4/4+x^3+x^2

3) Locate the critical points of the following function. Thenuse the Second Derivative Test to determine whether they correspondto local​ maxima, local​ minima, or neither.  f(x)=-x^3-3x^2

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In this question I have used first derivative to    See Answer
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