-The absolute maximum/ minimum could be the end points of the interval, but the relative minimum/maximum could not (absolute: closed interval, relative: open interval).
-When finding the intervals where a function is increasing/decreasing, make sure the number line is drawn as shown in the notes.
-The relative minimum/maximum can be found when you draw the arrows on the number line, so you can see where the graph would be at its highest and lowest points.
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