# Linear Algebra Question

**Question description**

Select all statements below which are true for all invertible n×n matrices A and B

1. AB=BA

2. (AB)^-1=A^-1B^-1

3. (A+B)^2= A^2+B^2+2AB

4. A+A^-1 is invertible

5. A^6 is invertible

6. (in-A)(in+A)=in-A^2

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