Answer
30, 330 or $\pi$/6, 11$\pi$/6
Work Step by Step
Use unit circle to find values
cos 30 = $\sqrt 3$/2
cos 330 = $\sqrt 3$/2
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 7 - Section 7.4 - Basic Trigonometric Equations - 7.4 Exercises - Page 569: 8
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