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

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.