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0:51
YouTube
sudgylacmoe
Deriving Every Trig Identity in a Minute
In this short, I derive many of the most important trigonometric identities, starting from the Taylor series of the sine and the cosine. Credit for the sum identity of the sine comes from Michael Hoppe from math.stackexchange, who in turn got it from E. Schmidt. https://math.stackexchange.com/questions/635077/proof-of-the-angle-sum-identity-for ...
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