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Mathematics
Mathematics
Problem
Vectors
a
and
b
satisfy
a
⋅
b
=
17
and
a
×
b
=
(
2
−
1
5
)
.
\mathbf{a} \cdot \mathbf{b} = 17 \text{ and } \mathbf{a} \times \mathbf{b} = \begin{pmatrix} 2 \\ -1 \\ 5 \end{pmatrix}.
a
⋅
b
=
17
and
a
×
b
=
2
−
1
5
.
Find, in degrees, the size of the angle between the two vectors.
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