Prove that the three lines from the orig...

Prove that the three lines from the origin O, with direction cosines `l_1,m_1,n_1; l_2,m_2,n_2;l_3,m_3,n_3` are coplaner if `|[l_1,m_1,n_1],[l_2,m_2,n_2],[l_3,m_3,n_3]|=0`

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