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: 48



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. -.766 4. ) 5. ENTER Therefore, $cos^{-1}(-.766)=2.443$ radians. Then, convert this number to degrees by multiplying by $\frac{180}{\pi}$. $2.443radians=(2.443(\frac{180}{\pi}))^{\circ}=140^{\circ}$.
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