Consider the following. (If an answer does not exist, enter DNE.) f(x) = x³ e-x (a) Find the interval(s) on which f is increasing. (Enter your answer using interval notation.) (0,6) (b) Find the interval(s) on which fis decreasing. (Enter your answer using interval notation.) (-∞,0),(6,∞) (c) Find the exact local minimum and maximum value of f. local minimum value 0 local maximum value 115

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