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: 2


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Work Step by Step

Tangent involves sides that are not the hypotenuse, so one side can be three times larger. However, the hypotenuse is always the longest side, so no other side can be three times larger than the hypotenuse, making the cosine inverse of 3 undefined.
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