Teaching EMRS PGT Mock Test 2023 Mathematics Three Dimensional Geometry Direction ratios and Direction cosines
If a line has the direction ratios -18, 12, -4, then its direction cosines are
1
\(\frac{{ - 9}}{{11}},\frac{6}{{11}},\frac{{ - 2}}{{11}}\)
2
\(\frac{{ - 9}}{{13}},\frac{6}{{13}},\frac{{ - 2}}{{13}}\)
3
\(\frac{9}{{13}},\frac{{ - 6}}{{13}},\frac{{ - 2}}{{13}}\)
4
None of these