If A and B are two square matrices such that AB=BA, then express (A+B)^2-A^2-B^2 in terms of A and B

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If A and B are two square matrices such that AB=BA, then express (A+B)^2-A^2-B^2 in terms of A and B

If A and B are two square matrices such that AB=BA, then express (A+B)^2-A^2-B^2 in terms of A and B