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If A=[[1,2],[3,4]],B=[[1,2],[2,1]]. Show...

If `A=[[1,2],[3,4]],B=[[1,2],[2,1]]`. Show that `(AB)^(-1)=B^(-1)A^(-1)`

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