cost+cos4t+cos7t / sint+sin4t+sin7t = cot4t

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 18E
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Verify the identity

cost+cos4t+cos7t / sint+sin4t+sin7t = cot4t

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