单位圆与三角函数线动态演示

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A_1
2. Point(xAxis) → B_1
3. Circle(A_1, B_1) → c
4. Rotate(B_1, α, A_1) → A
5. Angle(B_1, A_1, A) → θ
6. OrthogonalLine(A, xAxis) → a
7. OrthogonalLine(A, yAxis) → b
8. OrthogonalLine(B_1, xAxis) → d
9. Line(A_1, A) → e
10. Intersect(yAxis, b) → H
11. Intersect(a, xAxis) → B
12. Segment(A, H) → f
13. Segment(A_1, B) → g
14. Segment(H, A_1) → h
15. Segment(A, B) → i
16. Intersect(c, yAxis) → E, F
17. OrthogonalLine(F, yAxis) → j
18. Intersect(d, e) → Γ
19. Intersect(e, j) → Δ
20. Segment(F, Δ) → k
21. Segment(B_1, Γ) → l
22. Tangent(A, c) → m,
23. Intersect(m, xAxis) → T
24. Intersect(yAxis, m) → Σ
25. Segment(A_1, T) → n
26. Segment(A_1, T) → p
27. Segment(A_1, Σ) → q
28. Segment(A_1, B) → r
29. If(sin(θ) ≤ 0, 1, 0) → red
30. If(sin(θ) > 0, 1, 0) → ble
31. Segment(A_1, A) → s
32. If(cos(θ) ≤ 0, 1, 0) → redcos
33. If(redcos > 0, 0, 1) → blecos
34. If(tan(θ) ≤ 0, 1, 0) → redtan
35. If(redtan > 0, 0, 1) → bletan
36. Segment(Σ, T) → t
37. Line(F, E) → a_1
38. Line(A_1, B_1) → b_1