单位圆上的正弦、余弦和正切（角度）

GeoGebra 命令及参数

1. Point(c) → A
2. Point(c) → B
3. Point(c) → C
4. Point(c) → D
5. Arc(c, A, B) → quad1
6. Point(quad1) → P_1
7. Intersect(xAxis, yAxis) → E
8. Segment(P_1, E) → a
9. Angle(P_1, E, A) → α
10. Segment(P_1, Y_1) → b
11. Segment(P_1, X_1) → d
12. Arc(c, B, C) → quad2
13. Point(quad2) → P_2
14. Segment(P_2, E) → e
15. Angle(A, E, P_2) → β
16. Segment(P_2, X_2) → f
17. Segment(P_2, Y_2) → g
18. Arc(c, C, D) → quad3
19. Point(quad3) → P_3
20. Segment(P_3, X_3) → h
21. Segment(P_3, Y_3) → i
22. Segment(P_3, E) → j
23. Angle(A, E, P_3) → γ
24. Arc(c, D, A) → quad4
25. Point(quad4) → P_4
26. Segment(P_4, X_4) → k
27. Segment(P_4, Y_4) → l
28. Segment(P_4, E) → m
29. Angle(A, E, P_4) → δ
30. Point(m) → F
31. Point(j) → G
32. Point(e) → H
33. Point(a) → I
34. Angle(X_2, E, P_2) → acute_2
35. Angle(X_3, E, P_3) → acute_3
36. Angle(P_4, E, X_4) → acute_4