Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 7 - 7.2 - Verifying Trigonometric Identities - 7.2 Exercises - Page 521: 55



Work Step by Step

Use $sin(\frac{\pi}{2}-u)=sin(90°-u)=cos~u$ $sin^225°+sin^265°=sin^225°+sin^2(90°-25°)=sin^225°+cos^225°=1$
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