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 520: 11


The trigonometric Identity is verified. $(1-sin~α)(1+sin~α)=1-sin^2α=cos^2α$

Work Step by Step

We have that: $cos^2α+sin^2α=1$ $cos^2α=1-sin^2α$ So: $(1-sin~α)(1+sin~α)=1-sin^2α=cos^2α$
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