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Mathematics
Mathematics
Problem
Find the acute angle between the vectors
a
=
i
+
j
\mathbf{a}=\mathbf{i}+\mathbf{j}
a
=
i
+
j
and
b
=
i
+
k
\mathbf{b}=\mathbf{i}+\mathbf{k}
b
=
i
+
k
.
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