Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Mathematics Three Dimensional Geometry Direction ratios and Direction cosines
Find the angle between the pair of lines whose direction ratios are (3, 5, 4) and (1, 1, 2) respectively.
1
\({\sin ^{ - 1}}\left( {\frac{{8\sqrt 3 }}{{15}}} \right)\)
2
\({\cos ^{ - 1}}\left( {\frac{{8\sqrt 3 }}{{15}}} \right)\)
3
\({\cos ^{ - 1}}\left( {\frac{{16\sqrt 3 }}{{15}}} \right)\)
4
\({\sin ^{ - 1}}\left( {\frac{{16\sqrt 3 }}{{15}}} \right)\)
5
None of the above/More than one of the above.