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Mathematics
Problem
State the formula for the magnitude of a vector
a
=
a
1
i
+
a
2
j
+
a
3
k
\mathbf{a}=a_1\mathbf{i}+a_2\mathbf{j}+a_3\mathbf{k}
a
=
a
1
i
+
a
2
j
+
a
3
k
in
R
3
\mathbb{R}^3
R
3
.
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