Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapters 1-8 - Cumulative Test - Page 477: 2



Work Step by Step

$\cos\theta=0.9730$ can be rearranged as $\theta=\cos^{-1} 0.9730$. Ensuring that the calculator is in degrees, we type $\cos^{-1} 0.9730$ into the calculator and press enter: $\theta=\cos^{-1} 0.9730\approx13.3^{\circ}$.
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