freeCodeCamp/guide/english/mathematics/intro-to-the-trigonometric-.../index.md

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Intro to the Trigonometric Ratios

Intro to the Trigonometric Ratios

All of the trigonometric functions of an angle θ can be constructed geometrically in terms of a unit circle centered at O.

https://en.wikipedia.org/wiki/Trigonometry#/media/File:Circle-trig6.svg

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