Answer
$1.11$
Work Step by Step
Suppose $\theta = \cos^{-1} (\dfrac{4}{9})$
This gives: $\cos \theta=\dfrac{4}{9}$
Now, substitute the equation into a calculator.
Therefore, we have $ \cos^{-1} (\dfrac{4}{9})=1.11$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.7 - Inverse Trigonometric Functions - Exercise Set - Page 626: 24
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