CUET Mathematics - If is the angle between the lines L_1 and L_2, whose direction cosines are l_1, m_1, n_1 and l_2, m_2, n_2 respectively, then Match List-I with List-II | List-I | List-II | |---|---| | (A) | (I) l_1l_2+m_1m_2+n_1n_2 | | (B) | (II) l_1l_2+m_1m_2+n_1n_2=0 | | (C) L_1 and L_2 are perpendicular | (III) l_1/l_2=m_1/m_2=n_1/n_2 | | (D) L_1 and L_2 are parallel | (IV) sqrt((m_1n_2-m_2n_1)^2) | Choose the correct answer from the options given below: | PYQs + Solutions | AfterBoards