If is an identity with domain of validity D, which of the following must be true? I. For

Chapter 5, Problem 5.1.1.176

(choose chapter or problem)

Multiple Choice If f(x) = g(x) is an identity with domain of validity D, which of the following must be true?

I. For any x in D, f(x) is defined.

II. For any x in D, g(x) is defined.

III. For any x in D, f(x) = g(x).

(A) None

(B) I and II only

(C) I and III only

(D) III only

(E) I, II, and III

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