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Increasing/decreasing intervals & extremum points challenge

Problem

The function f(x)=1+2(x2)2/3 for x(6,6] is shown below.
Which of the following statements are true ?
I. The absolute maximum value of f for x(6,6] is 6.
II. The absolute maximum value of f for x(6,6] is 9.
III. The absolute maximum value of f for x(6,6] does not exist.
Choose 1 answer: