$$ \begin{array}{l}{\vec{u} \cdot(\vec{v}+\vec{w})=\vec{u} \cdot \vec{v}+\vec{u} \cdot \vec{w}} \ {\vec{v} \cdot \vec{w}=\vec{w} \cdot \vec{v}} \ {\vec{v} \cdot \vec ...

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