Trigonometric Function Evaluation

This example demonstrates the evaluation of trigonometric functions using the unit circle. Core math concepts include the definitions of sine, cosine, and tangent, and the relationship between points on the unit circle and angles. Construction highlights the use of GeoGebra commands like SelectedIndex, Sequence, Point, Angle, Circle, Segment, Midpoint, Rotate, Vector, CircleArc, If, etc., to visualize how trigonometric values change with angle variations via slider animations. Suitable for high school students learning trigonometric functions and their applications.