Trigonometry 7th Edition

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

Chapter 4 - Section 4.7 - Inverse Trigonometric Functions - 4.7 Problem Set - Page 261: 39



Work Step by Step

First, ensure that your calculator is in radians. On your graphing calculator, press the following sequence of buttons: 1. COS$^{-1}$ 2. ( 3. .8425 4. ) 5. ENTER Therefore, $arccos(.8425)=cos^{-1}(.8425)=.569$ radians. Then, convert this number to degrees by multiplying by $\frac{180}{\pi}$. $.569radians=(.569(\frac{180}{\pi}))^{\circ}\approx32.6^{\circ}$.
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