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    				| 1. | If l_1, m_1, n_1, and l_2, m_2, n_2 are the direction cosines of two mutually perpendicular lines, show that the direction cosines of the line perpendicular to both of these arem_1n_2-m_2n_1,n_1l_2-n_2l_1,l_1m_2-l_2m_1 | 
| Answer» `m_1n_2-m_2n_1,n_1l_2-n_2l_1,l_1m_2-l_2m_1` | |