How to evaluate a function for a point on a graph

The video tutorial covers the concept of the unit circle, explaining how to graph angles and understand coterminal angles. It discusses breaking down angles into thirds and the significance of π. The tutorial also provides a method to evaluate cosine for angles larger than 2π by simplifying the process and finding coordinate points on the unit circle. The focus is on understanding periodicity and using coterminal angles to simplify calculations.

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