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      <text>7.2.3.2 Between Task1 and Task2</text>
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      <text><![CDATA[<p>It is clear that \(AB\) and \(BA\) are <b>not</b> in general the same. In fact it is the <b>exception</b> that \(AB=BA.\) In the special case in which \(AB=BA\) we say that the matrices \(A\) and \(B\) <b>commute</b>.</p>]]></text>
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