Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 11 - Section 11.3 - The Tangent Ratio and Other Ratios - Exercises - Page 520: 38

Answer

a) Sine and cosine are off by 90 degrees. b) 0.59482

Work Step by Step

a) As we showed in problem 38, sine and cosine are off by 90 degrees. Thus, we know that just like it was for cosine, sine can be translated by 90 degrees to get the cosine function. b) We find that both expressions are equal to 0.59482, so we confirm our expectations that either side of the equation should be equal.
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