Answer
$0.6720$
Work Step by Step
$\cos s=0.7826$ can be written as $s=\cos^{-1} (0.7826)$.
Ensuring that the calculator is in radians, we type $\cos^{-1} (0.7826)$ into the calculator and solve:
$s=\cos^{-1} (0.7826)\approx0.6720$
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 3 - Radian Measure and the Unit Circle - Section 3.3 The Unit Circle and Circular Functions - 3.3 Exercises - Page 124: 62
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