Given a coordinate point, evaluate the six trigonometric functions

The video tutorial covers evaluating trigonometric functions by creating triangles on a coordinate grid. It explains the concept of reference angles and their coordinates on the unit circle. The tutorial guides students on constructing triangles perpendicular to the X-axis and calculating trigonometric functions using the Pythagorean theorem. It also emphasizes the importance of simplifying trigonometric expressions and rationalizing denominators.

What is the Pythagorean theorem used for in the context of trigonometric functions?

Describe the process of rationalizing the denominator when simplifying trigonometric functions.