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Note: The domain of a function is the set of all possible inputs for the function. So, the domain of a function f is the set of values of x for which the function f ( x ) is defined validly.The range of a function is the set of values that the function assumes. 

Or in other words, the domain of a function is the set of all possible independent values the function can take. It is the collection of all possible inputs. The range of a function is the set of all possible dependent values the function can produce from the domain values.