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1. |
If \(\rm \vec{a},\vec{b},\vec{c}\) are three non-coplanar vectors, then\(\rm (\vec{a}+\vec{b}+\vec{c}) \cdot[(\vec{a}+\vec{b}) \times( \vec{a}+\vec{c})]=\) |
A. | 0 |
B. | \(\rm [\vec{a}\; \vec{b} \;\vec{c}]\) |
C. | 2\(\rm [\vec{a}\; \vec{b} \;\vec{c}]\) |
D. | -\(\rm [\vec{a}\; \vec{b} \;\vec{c}]\) |
Answer» E. | |