Question: (a) Show that, if A and B are commuting square matrices, then (A + B)2 = A2 + 2AB + B2. (b) Find a pair

(a) Show that, if A and B are commuting square matrices, then (A + B)2 = A2 + 2AB + B2.
(b) Find a pair of 2 × 2 matrices A and B such that (A + B)2 + A2 + 2AB + B2.

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