Answer
$0$
Work Step by Step
As $\vec u=3\vec v$, we have $\vec u\parallel \vec v$ thus $\vec u\times\vec v=0$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 8 - Polar Coordinates; Vectors - Chapter Review - Review Exercises - Page 656: 58
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