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Mathematics
Mathematics
Problem
Find a unit vector perpendicular to each of the vectors
2
i
+
j
+
2
k
2\mathbf{i}+\mathbf{j}+2\mathbf{k}
2
i
+
j
+
2
k
and
i
−
2
j
+
k
\mathbf{i}-2\mathbf{j}+\mathbf{k}
i
−
2
j
+
k
.
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