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Three lines drawn from origin with direction cosines l_1,m_1,n_1 , l_2, m_2,n_2 , l_3,m_3,n_3 are coplanar iff : |(l_1,m_1,n_1),(l_2,m_2,n_2),(l_3,m_3,n_3)|=0 since : |
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Answer» intersecting LINES are coplanar |
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