Answer
$0$, which is the zero vector.
Work Step by Step
The sum of a vector and the same vector in a negative direction is $0$, which is the zero vector.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 9 - Polar Coordinates; Vectors - 9.4 Vectors - 9.4 Assess Your Understanding - Page 606: 2
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