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Mathematics
Problem
If
a
=
2
i
^
−
j
^
+
3
k
^
\mathbf{a}=2\hat{i}-\hat{j}+3\hat{k}
a
=
2
i
^
−
j
^
+
3
k
^
, calculate the magnitude of
−
3
a
-3\mathbf{a}
−
3
a
.
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