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- unitsize(1 cm);
- pair O, V, R;
- O = (0,0);
- V = (3,1);
- R = reflect(O,(2,-1))*(V);
- xaxis(-2,4);
- yaxis(-3,1);
- draw((-1)*(2,-1)--2*(2,-1));
- draw(O--V,Arrow(8));
- draw(O--R,Arrow(8));
- dot(O);
- label("$mathbf{v}$", (O + V)/2, N);
- label("$mathbf{r}$", (O + R)/2, W);
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