Geometric Demonstration of Reduction Formula VI (90°-α)

This GeoGebra applet dynamically demonstrates the trigonometric reduction formula VI, illustrating the relationship between the sine, cosine, and tangent of 90°-α and those of α. Through geometric constructions using the unit circle and right triangles, it visually derives sin(90°-α)=cosα, cos(90°-α)=sinα, and tan(90°-α)=cotα. Users can drag the slider to change the angle α and observe real-time c