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3:40
YouTube
The Complete Guide to Everything
How to Prove cos3x=4cos^3x - 3cosx - Easy Step by Step Tutorial
In this video, I will walk you through a simple and easy-to-follow step-by-step tutorial to show that cos3x=4cos^3x - 3cosx with full working and a step-by-step method.
11.9K views
Apr 13, 2023
Watch full video
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