Trigonometry (11th Edition) Clone

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



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: $s=\cos^{-1} (0.7826)\approx0.6720$
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