Teaching DSSSB PGT Mock Test 2025 Mathematics Three Dimensional Geometry Angle between two lines

Find the angle between two line, one of which has direction ratios 2, 2, 1 and the other is obtained by joining the points (3,1, 4) and (7, 2, 12) ?

1
cos-1 (2/3)
2
cos-1 (1/3)
3
cos-1 (5/3)
4
None of these
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