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If A=[[1,-1],[2,3]] and B=[[2,3],[-1,-2]...

If `A=[[1,-1],[2,3]]` and `B=[[2,3],[-1,-2]]`, then which of the following is/are correct? 1. `AB(A^-1B^-1)` is a unit matrix. 2. `(AB)^-1=A^-1B^-1`

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