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 201: 43

Answer

$$\cos^2 x=\frac{1}{\sec^2 x}$$ $\text{B}$ is the answer.

Work Step by Step

$$A=\cos^2 x$$ According to this Reciprocal Identity: $$\sec\theta=\frac{1}{\cos\theta}$$ $$\cos\theta=\frac{1}{\sec\theta}$$ Therefore, $A$ can be rewritten as follows: $$A=\frac{1}{\sec^2 x}$$ $\text{B}$ is the answer.
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.