Precalculus (6th Edition)

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

Chapter 7 - Trigonometric Identities and Equations - 7.7 Equations Involving Inverse Trigonometric Functions - 7.7 Exercises: 7

Answer

$x=\displaystyle \arccos\frac{y}{5}$

Work Step by Step

The goal is to isolate x. Divide with 5... $\displaystyle \frac{y}{5}=\cos x\qquad$ use the definition of arccos $\displaystyle \arccos\frac{y}{5}=x$
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