Answer
See below.
Work Step by Step
Plugging in the given value: $2\cos^4(\pi/2)-\cos^2(\pi/2)=2(0^4)-0^2=0-0=0$
Thus this is indeed a solution.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 14 Trigonometric Graphs, Identities, and Equations - 14.4 Solve Trigonometric Equations - 14.4 Exercises - Skill Practice - Page 935: 7
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