Algebra 2 (1st Edition)

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

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.
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