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6:53
YouTube
Kisker Educational Videos
Lesson 5.5 Part 1 Example 3 - Deriving a TRIPLE Angle Formula
We don't have any formulas for triple angles...that is, functions like sin(3x) or cos(3x)...but we can use double-angle formulas, in conjunction with sum-and-difference formulas, to derive them. In this video, I derive triple angle formulas for both sine and cosine.
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