Calculus (3rd Edition)

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 650: 47


$$ e=\langle \cos \frac{4 \pi }{7}, \sin \frac{4 \pi }{7}\rangle.$$

Work Step by Step

A unit vector $ e $ making an angle of $\frac{4 \pi }{7}$ with the x-axis is given by $$ e=\langle \cos \frac{4 \pi }{7}, \sin \frac{4 \pi }{7}\rangle.$$
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