本题目来源于试卷: Differential Calculus，类别为 IB数学
[问答题]
Let f(x)=0.5 $x^{3}-3.2 x $. There is a local maximum at point A and a local minimum at point B .
1. 1. Find the coordinates of point A .
2. Find the coordinates of point B .
2. Find the coordinates of the point of inflection of f .
3. Write down the values of x for which the graph of f has a negative rate of change.
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