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**1. Homework Statement**

Proof that if two matrices A and B are commutative, BA=AB, then the equations:

a) [tex](A+B)^2 = A^2 + 2AB + B^2[/tex] ; b)[tex](A+B)^3=A^3+3A^2B+3AB^2+B^3[/tex]

are true.

**2. Homework Equations**

**3. The Attempt at a Solution**

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