Calculus: Early Transcendentals (2nd Edition)

Published by Pearson
ISBN 10: 0321947347
ISBN 13: 978-0-32194-734-5

Chapter 1 - Functions - 1.4 Trigonometric Functions and Their Inverse - 1.4 Exercises - Page 48: 15



Work Step by Step

Let's glance at our unit circle. A quick glance tells us the answer is -1/2. Let's check with the calculator. Change the mode to radian, press (COS) then (2), ($\pi$), ($\div$), ($3$). You'll have your answer of -0.5000.
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