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

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

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