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4:57
YouTube
Mathletic by Sadia
Triple Angle formulas [Trigonometric Identities, Part 3]
Derivations of sin 3A, cos3A are explained in this video. This is the third part of the series of the derivation videos of trigonometric identities. 0:00 - Formulas 0:11 : Derivation of sin3A 2:23: Derivation of cos3A Check out the full playlist including all four parts of this series, Full Playlist link : https://www.youtube.com/watch?v ...
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