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 - Concept and Vocabulary Check - Page 575: 5


$cos\theta $ and $sec\theta $

Work Step by Step

For an angle $\theta$ in quadrant IV, we have $x\gt0, y\lt0$; thus $cos\theta=\frac{x}{r}\gt0$ and $sec\theta=\frac{r}{x}\gt0$. The answers are $cos\theta $ and $sec\theta $
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