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Prove that the three lines from O with d...

Prove that the three lines from O with direction cosines `l_1, m_1, n_1: l_2, m_2, n_2: l_3, m_3, n_3` are coplanar, if `l_1(m_2n_3-n_2m_3)+m_1(n_2l_3-l_2n_3)+n_1(l_2m_3-l_3m_2)=0`

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