cos(3x) - cos(5x) = 0 Please help. I got all solutions except the following two.  (pi) / 2 (3pi) / 2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section: Chapter Questions
Problem 30RE
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cos(3x) - cos(5x) = 0

Please help. I got all solutions except the following two. 

(pi) / 2

(3pi) / 2

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