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The "continuity" is not about the domain -- which is a closed and bounded interval, $[a,b]$.
Just a reminder from the quiz, however: since many of you missed these:
Notice that the interval is finite; notice that the extrema promised are global.
This is the relationship that we explore in this section.
Let's look at the graph of #5, p. 220. This is a graph of the derivative:
Questions:
You might notice that the function itself looks cubic, and hence think to yourself that the derivative probably looks quadratic....