Show that sin4 x = 1 - 2 cos2 x + cos4 x

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 84E
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Show that 

sin4 x = 1 - 2 cos2 x + cos

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