单位圆中的正弦、余弦和正切

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Textfield() → InputBox1
3. Intersect(g, xAxis, (1, 0)) → B
4. Intersect(g, yAxis, (0, 1)) → C
5. Rotate(B, Angle, A) → P
6. Angle(B, A, P) → β
7. OrthogonalLine(P, xAxis) → a
8. Intersect(a, xAxis) → D
9. Polygon(A, P, D) → poly1, d, a_1, b'
10. Angle(P, D, A) → γ
11. Tangent(B, g) → b
12. Tangent(B, g) → c
13. OrthogonalLine(B, xAxis) → e
14. Intersect(h, e, 1) → T
15. Angle(T, B, A) → δ
16. Distance(T, B) → distanceTB
17. Segment(B, T) → TB