linear algebra question 20
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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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