Origin of Trigonometry

So where do sin cos and tan come from?

Where do Sin, Cos and Tan Actually Come From - Origins of Trigonometry - Part 1

Why are Sine & Cosine given their names?

Trigonometry Concepts - Don't Memorize! Visualize!

A Geometric Understanding of the Trigonometric Functions (and proof of tan𝜃 ≡ sin𝜃/cos𝜃)

So how does your computer ACTUALLY compute sine? Basics of trig and more…

Trigonometric Functions: Sine, Cosine, Tangent, Cosecant, Secant, and Cotangent

History of Sine

Sine Curve and the Unit Circle

Where Do Sin, Cos, Tan Come From? Walkthrough The Narrative Of Discovery. Origins Of Trigonometry.

Trig Visualized: One Diagram to Rule them All (six trig functions in one diagram)

Trigonometry - Easy to understand 3D animation

Sine Wave | Simple Explanation on a Giant or Ferris Wheel | Trigonometry | Learnability

Unit Circle Trigonometry - Sin Cos Tan - Radians & Degrees

Finding Sin, Cos, Tan using Triangles in Trigonometry

Sin Cos Tan! Intro to sine, cosine, and tangent AND sample problems!

Basic Trigonometry: Sin Cos Tan (NancyPi)

Relationship Between Sin, Cos and Tan

Imaginary Numbers Are Real [Part 1: Introduction]