Teaching EMRS PGT Mock Test 2023 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
\({\sin ^{ - 1}}\left( {\frac{{16\sqrt 3 }}{{15}}} \right)\)