Answer
$$ (\cos 20, -\sin 20).$$
Work Step by Step
Recall that $\cos(-x)=\cos(x)$.
Recall that $\sin(-x)=-\sin(x)$.
Find the components of $ w $
$$(\cos (-20), \sin(-20))=(\cos 20, -\sin 20).$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 13 - Vector Geometry - 13.1 Vectors in the Plane - Exercises - Page 649: 7
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