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Mathematics
Mathematics
Problem
The angle between a line with direction ratios proportional to 2, 2, 1 and a line joining
(
3
,
1
,
4
)
(3, 1, 4)
(
3
,
1
,
4
)
to
(
7
,
2
,
12
)
(7, 2, 12)
(
7
,
2
,
12
)
, is a.
cos
−
1
(
2
3
)
\cos^{-1}\left(\frac{2}{3}\right)
cos
−
1
(
3
2
)
b.
cos
−
1
(
−
2
3
)
\cos^{-1}\left(-\frac{2}{3}\right)
cos
−
1
(
−
3
2
)
c.
tan
−
1
(
2
3
)
\tan^{-1}\left(\frac{2}{3}\right)
tan
−
1
(
3
2
)
d. None of these
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