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: 63


$\sin -270^{\circ}=1$

Work Step by Step

1. What we know about -270 degree angle $\theta=90^{\circ}$ (because it is a co-terminal angle and values of x and y will be the same) $x=0$ $y=1$ $r=1$ 2. Substitute in: $\sin\theta=\frac{y}{r}=\frac{1}{1}=1$
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