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Mathematics
Mathematics
Problem
Determine the value of
k
k
k
for which the angle between the vectors
a
=
(
k
,
2
,
2
)
\mathbf{a}=(k,2,2)
a
=
(
k
,
2
,
2
)
and
b
=
(
1
,
−
1
,
4
)
\mathbf{b}=(1,-1,4)
b
=
(
1
,
−
1
,
4
)
is
60
∘
60^{\circ}
6
0
∘
.
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