Define a function

(The function is not defined if or .)

- Graph of .
- Let . Then the domain of is all such that . The graph is:
- Let . Then the domain of is all such that . The graph is below.
- Let . Then the domain is empty and so there is nothing to graph. (The domain is empty since is only defined for and is only defined for . There are no that satisfy both of these conditions.)

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