Evaluating the cosine of an angle using coterminal angles

The video tutorial explains angle measurement, focusing on the concept of pi and how it relates to wrapping a circle. It introduces coterminal angles and demonstrates how to simplify angle measurements by adding or subtracting 2π. The tutorial also covers the unit circle, highlighting major points and their coordinates, and explains how to reflect these points across quadrants.

How can adding or subtracting 2π help in finding coterminal angles?

Describe how to reflect points from the first quadrant to the third quadrant on the unit circle.

What is the relationship between the cosine of an angle and the x-coordinate of a point on the unit circle?