Question: Can someone please help me out with the question below? I need a rigorous proof. Exercise 3.3.22 Let (X, d) be a metric space. Let

Can someone please help me out with the question below? I need a rigorous proof.

Exercise 3.3.22 Let (X, d) be a metric space. Let A be an open set in X, and let B be a closed set in X. Show that A \\ B is open and B \\ A is closed

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