Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test 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
\(\frac{{\rm{\pi }}}{2}\)
5
None of the above/More than one of the above.