The angle between two lines whose direction cosines are l1, m1, n1 and l2, m2, n2 is –

Question

TuteeHUB · Accepted Answer

${\tan ^{ - 1}}\left( {{l_1}{l_2} + {m_1}{m_2} + {n_1}{n_2}} \right)$

TuteeHUB · Answer

${\sin ^{ - 1}}\left( {{l_1}{l_2} + {m_1}{m_2} + {n_1}{n_2}} \right)$

TuteeHUB · Answer

${\cos ^{ - 1}}\left( {{l_1}{l_2} + {m_1}{m_2} + {n_1}{n_2}} \right)$

TuteeHUB · Answer

${\cot ^{ - 1}}\left( {{l_1}{l_2} + {m_1}{m_2} + {n_1}{n_2}} \right)$

1.	The angle between two lines whose direction cosines are l1, m1, n1 and l2, m2, n2 is –
A.	\({\sin ^{ - 1}}\left( {{l_1}{l_2} + {m_1}{m_2} + {n_1}{n_2}} \right)\)
B.	\({\cos ^{ - 1}}\left( {{l_1}{l_2} + {m_1}{m_2} + {n_1}{n_2}} \right)\)
C.	\({\tan ^{ - 1}}\left( {{l_1}{l_2} + {m_1}{m_2} + {n_1}{n_2}} \right)\)
D.	\({\cot ^{ - 1}}\left( {{l_1}{l_2} + {m_1}{m_2} + {n_1}{n_2}} \right)\)
Answer» C. \({\tan ^{ - 1}}\left( {{l_1}{l_2} + {m_1}{m_2} + {n_1}{n_2}} \right)\)

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