Teaching HTET TGT Level 2 - 2024 Mock Test Mathematics Three Dimensional Geometry Direction ratios and Direction cosines
If cosines of angles made by vector with coordinate axes are l, m and n then which option is correct?
1
l + m + n = 0
2
l2 + m2 + n2 = 1
3
l + m + n = 1
4
l2 + m2 + n2 = 0