Let
V
=
R
3
V=R
3
be the inner product space with usual inner product. If
θ
θ is the angle between
(
5
,
13
,
18
)
(5,13,18) and
(
a
,
b
,
c
)
(a,b,c) where
5
a
+
13
b
+
18
c
=
0
5a+13b+18c=0 and
(
a
2
+
b
2
+
c
2
)
≠
0
(a
2
+b
2
+c
2
)
=0, then find the value of
cos
θ
cosθ.
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