Answer
$-\frac{2}{5}$
Work Step by Step
1.Reciprocal identity
$\cos\theta=\frac{1}{\sec\theta}$
2. Substitute the given value:
$\cos\theta=\frac{1}{-\frac{5}{2}}=-\frac{2}{5}$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
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
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