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