Algebra and Trigonometry 10th Edition

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

Chapter 6 - 6.2 - Right Triangle Trigonometry - 6.2 Exercises - Page 442: 48


The identity is verified. $sin^2θ-cos^2θ=2sin^2θ-1$

Work Step by Step

Use: $sin^2θ+cos^2θ=1$ $sin^2θ-1=-cos^2θ$ $sin^2θ-cos^2θ=sin^2θ+sin^2θ-1=2sin^2θ-1$
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