Final answer:
An example of a formula that is logically equivalent to A ↔ B is (A → B) ∧ (B → A).
Step-by-step explanation:
An example of a formula that is logically equivalent to A ↔ B is (A → B) ∧ (B → A). This formula states that A implies B and B implies A, which is the same as saying A if and only if B. The logical operator ↔ represents a bidirectional implication, meaning that both statements are true or false simultaneously.