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3. Show that if A is invertible then AT is also invertible. Hence ShOW that (AT)_1 : (A'1)T for a b A : is 4

3. Show that if A is invertible then AT is also invertible. Hence ShOW that (AT)_1 : (A'1)T for a b A : is 4 for a; b, 0,6! 6 R. [2 marks]

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