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If B is a real mxn matrix, show that B'B...

If `B` is a real `mxn` matrix, show that `B'B` as well as `BB'`is a symmetric matrix.

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  11. If A and B are any two square matrices of the same order than ,

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  12. IF A = [{:( -2,3,-1),( -1,2,-1),( -6,9,-4) :}] and B = [{:( 1,3,-1),(...

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