Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 3 - Test - Page 138: 17b



Work Step by Step

$\cos s=\frac{1}{2}$ can be rearranged as $s=\cos^{-1} (\frac{1}{2})$. Ensuring that the calculator is in radians, we type $\cos^{-1} (\frac{1}{2})$ into the calculator and solve. Therefore, $s=\cos^{-1} (\frac{1}{2})=\frac{\pi}{3}$
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