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3:27
YouTube
Ravi Ranjan Kumar Singh
cos2x | cos(2x) | Identity for cos2x in terms of tanx | Proof of cos2x identity in terms of tanx
In this video, we are going to derive the identity for cosine of 2x in terms of tangent of x. The proof of the identity cos(2x) is explained in following video URL, https://youtu.be/NTgX1EY6Poo The following video URL explains the identity sec^2(x) = 1 + tan^2(x) https://youtu.be/T7jO9QG6rG4 #cosine #cos2x #cos(2x) #cosineof2x You can email me ...
3.2K views
Nov 27, 2018
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