Answer
$\theta=90°$
Work Step by Step
$\theta=cos^{-1}\frac{u\cdot v}{|u||v|}=cos^{-1}\frac{(-5i-5j)(-8i+8j)}{\sqrt {(-5i-5j)(-5i-5j)}\sqrt {(-8i+8j)(-8i+8j)}}=cos^{-1}\frac{40-40}{\sqrt {25+25}\sqrt {64+64}}=cos^{-1}~0$
$\theta=90°$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 8 - 8.4 - Vectors and Dot Products - 8.4 Exercises - Page 595: 41
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