Answer
$1.25$
Work Step by Step
Suppose $\theta = \cos^{-1} (\dfrac{\sqrt 5}{7})$
This gives: $\cos \theta=\dfrac{\sqrt 5}{7}$
Now, substitute the equation into a calculator.
Therefore, we have $ \cos^{-1} (\dfrac{\sqrt 5}{7})=1.25$
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: 25
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