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 - Page 26: 42

Answer

positive

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
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.