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May 24th, 2018
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  1. documentclass{standalone}
  2. usepackage{tikz}
  3.  
  4. begin{document}
  5. begin{tikzpicture}
  6. draw[->] (0,0) -- (-1,1.732050808) node[anchor=south] {$b$}; % (2*cos(2*pi/3),2*sin(2*pi/3))
  7. draw[->] (0,0) -- (2,0) node[anchor=west] {$a$};
  8. draw[dashed] (-0.5,0.866025404) -- (0.5,0.866025404);
  9. draw[dashed] (1,0) -- (0.5,0.866025404) node[anchor=west] {$X$};
  10. node[anchor=north] at (1,0) {$1$};
  11. node[anchor=east] at (-0.5,0.866025404) {$1$};
  12. end{tikzpicture}
  13. end{document}
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