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    Help with dot product for vectors

    Question Let vectors \vec{A} =(2,1,-4), \vec{B}=(-3,0,1), \vec{C}=(-1,-1,2). What is the angle (in radians) \theta_{AB} between \vec{A} and \vec{B}? Important equations \vec{A} \cdot \vec{B} = \vert \vec{A} \vert \,\vert \vec{B}\vert \cos(\theta), where \theta is the angle between \vec{A}...
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