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AP EAMCET Engineering 2014 Code A Solved Paper
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© examsnet.com
Question : 61
Total: 160
If
A
(
3
,
4
,
5
)
,
B
(
4
,
6
,
3
)
,
C
(
−
1
,
2
,
4
)
and
D
(
1
,
0
,
5
)
are such that the angle between the line
−
D
C
and
−
A
B
is θ then
c
o
s
θ
=
2
9
4
9
5
9
7
9
Validate
Solution:
D
C
=
(
2
,
−
2
,
1
)
A
B
=
(
1
,
2
,
−
2
)
c
o
s
θ
=
|
2
−
4
−
2
|
3
×
3
=
4
9
© examsnet.com
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