Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 5 - Trigonometric Identities - Section 5.1 Fundamental Identities - 5.1 Exercises - Page 200: 24


$\cos\theta=3$ is wrong. The domain of $\cos\theta$ only ranges from $-1$ to $1$.

Work Step by Step

The problem here is with the statement $\cos\theta=3$. As we know, the domain of $\cos\theta$ only ranges from $-1$ to $1$. In other words, the value of $\cos\theta$ cannot exceed $1$. Therefore, $\cos\theta=3$ is impossible.
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.