\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Compute \(\mathrm{tr}(A)\) for \(A = \begin{pmatrix} 5 & 1 & 2 \\ 0 & -3 & 4 \\ 7 & 1 & 8 \end{pmatrix}\).
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