Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 7 - Trigonometric Identities and Equations - Chapter 7 Test Prep - Review Exercises - Page 738: 101


$-\dfrac {1}{2}$

Work Step by Step

$csc^{-1}x=\cos ^{-1}\dfrac {1}{x};$ $\cos \left( \cos ^{-1}x\right) =x$ $\Rightarrow \cos \left( csc-1\left( -2\right) \right) =\cos \left( \cos ^{-1}\left( \dfrac {1}{-2}\right) \right) =-\dfrac {1}{2}$
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.