Checkpoint 3

1. What is the domain of the function `ftext[(]x text[)]=1/(2-x)` in Example 3?
2. What is the domain of `f^-1text[(]x text[)]=2-1/x`?
3. How is the domain of `f^-1` related to the set of values of `f`?
4. How is the domain of `f` related to the set of values of `f^-1`?