Answer
$sin^225°+sin^265°=1$
Work Step by Step
Use $sin(\frac{\pi}{2}-u)=sin(90°-u)=cos~u$
$sin^225°+sin^265°=sin^225°+sin^2(90°-25°)=sin^225°+cos^225°=1$
Algebra and Trigonometry 10th Edition
by Larson, Ron
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
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