Answer
(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 $.
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 - 13.3 Dot Product and the Angle Between Two Vectors - Preliminary Questions - Page 666: 6
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