A unit circle is an important part of trigonometry and can define right angle relationships known as sine, cosine and tangent.

This script, while still a work in progress, provides a helpful tool for visualizing the unit circle, angles, and trigonometric functions. Developed in collaboration with Claude and GPT, it ...

Using the unit circle to define the sine, cosine, and tangent functions ...

Part of that is the way it's taught. Students are taught the "unit circle" and its relationship to trigonometry, but many fail to make the leap on how crucial circles are for trig functions.

Precalculus : concepts through functions : a unit circle approach to trigonometry by Sullivan, Michael, 1942- author Publication date 2015 Topics Functions -- Textbooks, Trigonometry -- Textbooks, ...