Answer :

(AB)(AB)-1 = I

A-1(AB)(AB)-1 = IA-1

(A-1A)B (AB)-1=A-1

IB(AB)-1 = A-1

B(AB)-1 = A-1

B-1B(AB)-1 = B-1 A-1

I (AB)-1 = B-1A-1

(AB)-1 = B-1A-1

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