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Which of the following about the trace o...

Which of the following about the trace of a matrix is false? (1) `tr (ABC)=tr(BCA) != tr(ACB)= tr(BAC) = tr(CBA)` (2) `tr(AB) = tr(BA)` (3) `tr(A-B) = trA - trB` (4) `tr(A^2)= (trA)^2`

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