Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 4 - Section 4.4 - Trigonometric Functions of Any Angle - Exercise Set - Page 576: 108


Let us consider an angle $\theta $ which is not an acute angle that lies in a quadrant. The positive acute angle formed by the x-axis and the terminal side of $\theta $, is the reference angle ${\theta }'$.The reference angle varies according to the quadrant in which $\theta $ lies.

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