单位圆与三角函数（动画）

GeoGebra 命令及参数

1. Point(xAxis) → A
2. Circle(A, 1) → c
3. Intersect(c, xAxis, 2) → B
4. Rotate(B, α, A) → P
5. Angle(B, A, P) → β
6. Segment(A, P) → a
7. OrthogonalLine(P, xAxis) → b
8. Intersect(b, xAxis) → C
9. Tangent(B, c) → d,
10. Line(A, P) → e
11. Intersect(e, d) → D
12. Segment(A, C) → f
13. Segment(C, P) → g
14. Segment(B, D) → h
15. Ray(H, U) → q
16. Ray(I, V) → r
17. Segment(V, U) → l
18. Segment(X, W) → m
19. Segment(Z, Y) → n
20. Segment(G, F) → p
21. Segment(J, K) → s
22. Segment(K, O) → t
23. Segment(K, Q) → a_1
24. Segment(M, A_1) → b_1
25. Segment(M, B_1) → c_1
26. Segment(J, C_1) → d_1
27. Segment(J, D_1) → e_1
28. Segment(L, N) → f_1
29. Segment(L, E) → g_1
30. Segment(M, M') → h_1
31. Segment(P, S) → j
32. Segment(D, T) → i_1