Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises: 75



Work Step by Step

1. What we know about -900 degree angle $\theta=180^{\circ}$ (because it is a co-terminal angle and values of x and y will be the same) $x=-1$ $y=0$ $r=1$ 2. Substitute in: $\cos\theta=\frac{x}{r}=\frac{-1}{1}=-1$
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