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

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

#### 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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