**24(a) **

is defined on any interval such that Clearly Then could be any interval on which e.g., or ...etc.

For Both functions are continuous when i.e., or Then the domain of continuity of both functions is

**21. **

Since belongs to the domain of continuity , then Theorem 1.1 guarantees the existence of a unique solution.

**22. **

Since is not in the domain of continuity, Theorem 1.1 does not guarantee the existence or the uniqueness of a solution.

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