Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 13, Trigonometric Ratios and Functions - 13.4 Evaluate Inverse Trigonometric Functions - 13.4 Exercises - Skill Practice - Page 878: 15

Answer

$ 1.98$ radians and $113.6^{\circ}$

Work Step by Step

We are given that $\cos^{-1} (-0.4)$ In order to get the answer in radians, we need to put the calculator in radians mode. Then, our result will be: $ 1.98$ radians In order to get the answer in degrees, we need to put the calculator in degrees mode. Then, our result will be: $113.6^{\circ}$
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