Prove the following: - 94988

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Prove the following: 1- if det(A)=0 , then AB is singular . 2- if A and B are invertible then AB is invertible . with (AB)^-1 = B^-1 A^-1 3- if A is invertible and B , C are inverses of A , the B=C . 4- if A is invertible then det (A^-1)= 1/det (A) .
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Prove_the_following-_if_det(A)0_,_then_AB_is_singular.docx
Prove_the_follo...