The function is defined as follows. Complete parts (a) to (d) below.
(a) Find the domain of the function.
The domain of the function is
(Type your answer in interval notation.)
We must determine all -values for which is defined.
The first piece covers in the interval .
The second piece covers .
The third piece covers in the interval .
Combining these intervals, the function is defined for every in the interval from to .
In interval notation, the domain of is
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The function is defined for three different cases, which gives us insight into its domain. The first case, , corresponds to the interval . The second case, , adds the single point 1 to the domain. Finally, the third case, , corresponds to the interval . By combining these intervals, we find that the domain of the function is:
This captures all values from to , including and , but not including numbers below or .