Expand 5cos^4(2pi*t) into the form 5/8(4cos(4pit)+cos(8pit)+3)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.4: Values Of The Trigonometric Functions
Problem 21E
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Expand 5cos^4(2pi*t) into the form 5/8(4cos(4pit)+cos(8pit)+3)
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