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15. If $\mathbf{a}, \mathbf{b}$ and $\mathbf{c}$ are unit coplanar vectors then the scalar triple product $[2 \mathbf{a}-\mathbf{b} 2 \mathbf{b}-\mathbf{c} 2 \mathbf{c}-\mathbf{a}]$ is equal to
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Here $[\mathbf{a} \mathbf{b} \mathbf{c}]=0$
The given scalar triple product $=k[\mathbf{a b} \mathbf{c}]=0$.
The given scalar triple product $=k[\mathbf{a b} \mathbf{c}]=0$.
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