Teaching RPSC School Lecturer Mock Test Series 2024 Mathematics Three Dimensional Geometry Direction ratios and Direction cosines
Find the direction cosines of the vector \(\vec r = 2\hat i + 3\hat j + \;\hat k\)?
1
\(\frac{2}{{\sqrt {14} }},\frac{3}{{\sqrt {14} }}\;and\frac{1}{{\sqrt {14} }}\)
2
\(- \frac{2}{{\sqrt {14} }},\frac{3}{{\sqrt {14} }}\;and\frac{1}{{\sqrt {14} }}\)
3
\(- \frac{2}{{\sqrt {14} }},- \frac{3}{{\sqrt {14} }}\;and\frac{1}{{\sqrt {14} }}\)
4
None of these
5
Question Not Attempted