Teaching UP TGT Mock Test Series 2025 Mathematics Vector Algebra Magnitude and Directions of a Vector
The direction cosines of the vector \(\vec a = (-2\hat i + \hat j -5 \hat k)\) are?
1
-2, 1, -5
2
\(\frac 1 3, \frac {-1}6, \frac {-5}6\)
3
\(\frac 2 {\sqrt {30}},\frac 1 {\sqrt {30}},\frac 5 {\sqrt {30}}\)
4
\(\frac {-2} {\sqrt {30}},\frac 1 {\sqrt {30}},\frac {-5} {\sqrt {30}}\)