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if A=[{:(1,0,-3),(2,3,4),(-4,5,-2):}]and...

`if A=[{:(1,0,-3),(2,3,4),(-4,5,-2):}]and b=[{:(3,0,-1),(2,5,-4),(4,-1,2):}],`then show that :
`(AB)'=B'A'`

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