Question
If $\vec{a}$, $\vec{b}$, and $\vec{c}$ are nonzero coplanar vectors, then $[2\vec{a},\ 3\vec{b} - \vec{c},\ 4\vec{c} - \vec{a}] = $ ...........
If $\vec{a}$, $\vec{b}$, and $\vec{c}$ are nonzero coplanar vectors, then $[2\vec{a},\ 3\vec{b} - \vec{c},\ 4\vec{c} - \vec{a}] = $ ...........