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Matriceshard
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The trace of a matrix is the sum of its diagonal elements. If A=(310251012)A = \begin{pmatrix} 3 & 1 & 0 \\ 2 & 5 & 1 \\ 0 & 1 & 2 \end{pmatrix}A=​320​151​012​​, what is tr(A)\text{tr}(A)tr(A)?