Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 4 - Section 4.7 - Inverse Trigonometric Functions - Exercise Set - Page 626: 46


Not defined

Work Step by Step

Suppose $\theta =\cos^{-1} (3 \pi)$ This gives: $\cos \theta=\cos[\cos^{-1} (3 \pi)]$ The inverse property states that $\cos(\cos^{-1} a)=a $ satisfies for every $ a $ in the range $[0,\pi]$ . But the value $ a=3 \pi $ does not lie in the range of $[-1,1]$. Therefore, we have $\cos[\cos^{-1} (3 \pi)]$= Not defined
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.