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Mathematics
Mathematics
Problem
Calculate the acute angle between the vectors
a
=
(
2
,
1
,
−
2
)
\mathbf{a}=(2,1,-2)
a
=
(
2
,
1
,
−
2
)
and
b
=
(
3
,
−
1
,
1
)
\mathbf{b}=(3,-1,1)
b
=
(
3
,
−
1
,
1
)
. a)
45
∘
45^{\circ}
4
5
∘
b)
72
∘
72^{\circ}
7
2
∘
c)
60
∘
60^{\circ}
6
0
∘
d)
70
∘
70^{\circ}
7
0
∘
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