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Domain Requirement for Function Composition

When mathematically evaluating a composite function (fg)(x)(f \circ g)(x), the calculated output of the inner function, g(x)g(x), strictly serves as the direct input for the outer function, ff. Because any mathematical function can only be validly evaluated using inputs that reside within its defined domain, it is an absolute requirement that the specific numerical value of g(x)g(x) is a valid element within the domain of the function ff. If the resulting output of gg falls outside the domain of ff, the entire composite function cannot be evaluated at that specific initial xx-value.

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Updated 2026-05-26

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