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| 1. |
\overline{a}=2 i-3 j+6 k, \overline{b}=2 i+j-4 k then provethat (\overline{a}+\overline{b}) \cdot(\overline{a}-\overline{b})=|\overline{a}|^{2}-|\overline{b}|^{2} |
| Answer» | |