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: 42



Work Step by Step

1. r is always positive, because of square root 2. Let's consider quadrants and sign of (x,y) coordinates $quadrant (x,y):$ $Quad I $ $(+,+)$ $Quad II $ $(-,+)$ $Quad III$ $(-,-)$ $Quad IV$ $ (+,-)$ 3.In Q1 x is positive , so $\frac{x}{r}$ is positive
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