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Why are Sine & Cosine given their names?
Where do Sin, Cos and Tan Actually Come From - Origins of Trigonometry - Part 1
TR-13Z: How the Co- Trig Functions got their Names
Trig Visualized: One Diagram to Rule them All (six trig functions in one diagram)
Why sin and cos don't mean anything
So where do sin cos and tan come from?
Trigonometric Substitution - Tangent Substitution - Trigonometric Substitution for Integrals
Origin of Trigonometry
What is the Sine Function? | Don't Memorise
Why are Tangent & Secant given their names?
A Geometric Understanding of the Trigonometric Functions (and proof of tan𝜃 ≡ sin𝜃/cos𝜃)
05 - Sine and Cosine - Definition & Meaning - Part 1 - What is Sin(x) & Cos(x) ?