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- documentclass{standalone}
- usepackage{tikz}
- begin{document}
- begin{tikzpicture}
- draw[->] (0,0) -- (-1,1.732050808) node[anchor=south] {$b$}; % (2*cos(2*pi/3),2*sin(2*pi/3))
- draw[->] (0,0) -- (2,0) node[anchor=west] {$a$};
- draw[dashed] (-0.5,0.866025404) -- (0.5,0.866025404);
- draw[dashed] (1,0) -- (0.5,0.866025404) node[anchor=west] {$X$};
- node[anchor=north] at (1,0) {$1$};
- node[anchor=east] at (-0.5,0.866025404) {$1$};
- end{tikzpicture}
- end{document}
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