Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 1 - Trigonometric Functions - Section 1.4 Using the Definitions of the Trigonometric Functions - 1.4 Exercises - Page 37: 17

Answer

$-\frac{2}{5}$

Work Step by Step

1.Reciprocal identity $\cos\theta=\frac{1}{\sec\theta}$ 2. Substitute the given value: $\cos\theta=\frac{1}{-\frac{5}{2}}=-\frac{2}{5}$
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