Answer
$\pi-3$
Work Step by Step
Given: $2arccos(\frac{y-\pi}{3})=2\pi$
$arccos(\frac{y-\pi}{3})=\pi$
$(\frac{y-\pi}{3})=cos(\pi)$
$(\frac{y-\pi}{3})=-1$
$({y-\pi})=-3$
Hence, $y=\pi-3$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 6 - Inverse Circular Functions and Trigonometric Equations - Section 6.4 Equations Involving Inverse Trigonometric Functions - 6.4 Exercises - Page 286: 31
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