A brief look at the origins of the trigonometric functions, how to understand them geometrically, and where their names come from. Thanks for watching!
Basically this is a proof of tan𝜃 ≡ sin𝜃/cos𝜃, with some context.
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Негізгі бет A Geometric Understanding of the Trigonometric Functions (and proof of tan𝜃 ≡ sin𝜃/cos𝜃)
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