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\begin{tikzpicture}[scale=1.5] \tkzInit[xmax=3,ymax=2] \tkzAxeXY \tkzDefPoint(2,1){a} \tkzPointShowCoord(a) \tkzDrawPoint(a) \tkzLabelPoint(a){$A_1$} \tkzPointShowCoord({1,2}) \tkzDrawPoint({1,2}) \tkzLabelPoint({1,2}){$A_2$} \end{tikzpicture}