Soient:
$$\quad A\left(-\frac{\sqrt{3}}3\right),~M(z)\quad\text{et}\quad M'(z')\quad$$ tels que :$$\qquad z'=(1+i\sqrt{3})z+i$$
Calculer l'angle: $$~~\widehat{\left(\overrightarrow{AM}~,~\overrightarrow{AM'}\right)}.$$
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