Answer
$\theta =\cos ^{-1}\left( \dfrac {x}{3}\right) $
Work Step by Step
This is a right triangle with hypothenus 3
So
$x=3\cos \theta \Rightarrow \cos \theta =\dfrac {x}{3}\Rightarrow \theta =\cos ^{-1}\left( \dfrac {x}{3}\right) $
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 6 - Review - Exercises - Page 529: 67
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