Answer
$1-2cos^2x+cos^4x=(1-cos^2x)^2$
Work Step by Step
$1-2cos^2x+cos^4x=1^2-2(1)(cos^2x)+(cos^2x)^2=(1-cos^2x)^2$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - 7.1 - Using Fundamental Identities - 7.1 Exercises - Page 513: 25
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