Teaching EMRS PGT Mock Test 2023 Mathematics Three Dimensional Geometry Direction ratios and Direction cosines
What is the angle between the two lines whose direction numbers are \(\left( {\sqrt 3 - 1, - \sqrt 3 - 1,4} \right){\rm{\;and\;}}\left( { - \sqrt 3 - 1,\sqrt 3 - 1,4} \right)?\)
1
\(\frac{{\rm{\pi }}}{6}\)
2
\(\frac{{\rm{\pi }}}{4}\)
3
\(\frac{{\rm{\pi }}}{3}\)
4
\(\frac{{\rm{\pi }}}{2}\)