Generating One Period of Sine and Cosine Graphs

This GeoGebra example demonstrates constructing sine and cosine graphs over one full period using trigonometric lines. Core concepts include trigonometric functions, 2D vector multiplication, rotation, and parallelogram law. Construction uses Circle for the unit circle, Rotate for angle operations, Intersect and OrthogonalLine for intersections, Segment and Polygon for auxiliaries, and Locus to trace curves. Ideal for high school math instruction, coordinate geometry, and function visualization.