4d Example 1 (Evaluate Trig Functions using intercepts of the unit circle)

The video tutorial explains how to evaluate the sine, cosine, and tangent of angles at 90 and -90 degrees using the unit circle. It highlights the limitations of using right triangles for these angles and emphasizes the importance of the unit circle's coordinate points. The tutorial also discusses reflections and how they affect trigonometric evaluations on the axes.

Describe the relationship between the unit circle and the sine and cosine values.

What are the sine, cosine, and tangent values for 90 degrees?

Explain why the tangent of 90 degrees is undefined.

How do the sine, cosine, and tangent values change when evaluating -90 degrees?

What is the significance of the coordinates (0, 1) and (0, -1) in relation to sine and cosine?