Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 13 - Vector Geometry - 13.3 Dot Product and the Angle Between Two Vectors - Preliminary Questions - Page 666: 6


(c) $ e_u\cdot e_v $.

Work Step by Step

Since we have $ e_u\cdot e_v=\frac{u\cdot v}{\|u\|\|v\|}=\cos \theta $, then the right answer is (c) $ e_u\cdot e_v $.
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