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4. Show that, for any matrixes A and B, if AB is defined, then BTAT is also defined, and (AB)T BTAT. (Hint: use either brute force or analytic method to show ((AB)T), (B Ai for all i and j 5. Assume both A and B are square matrixes and are full rank, and AB is defined. Show (AB)-1B-A-1. (Hint: use the rule for matrix multiplication and the definition for matrix inverse.)

These 2 questions ..thank you

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