Cleanup
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@@ -31,7 +31,7 @@ Can you develop geometric intuition for their sum and difference?
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\begin{tikzpicture}[scale=1]
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\draw[->]
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(0,0) coordinate (o) -- node[below left] {$(1, 2)$}
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(0,0) coordinate (o) -- node[below left] {$(2, -1)$}
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(2, -1) coordinate (a)
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;
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