单位圆与正切函数图示

GeoGebra 命令及参数

1. Point(Ray[(0, 0), (-1, 0)]) → B
2. Rotate(A, θ, B) → P
3. Segment(A, Intersect[Line[B, P], x = x(A)]) → h
4. Segment(P, Intersect[Line[B, P], x = x(A)]) → g
5. Rotate(A, θ, B) → A'
6. Angle(A, B, A') → α
7. Rotate(A, θ, B) → A'_1
8. Angle(A, B, A'_1) → β
9. Segment(Q, (x(Q), 0)) → e
10. Circle(B, A) → c
11. Segment(B, P) → a
12. Vector((x(B), y(Corner[1])), (x(B), y(Corner[4]))) → u
13. Vector((0, y(Corner[1])), (0, y(Corner[4]))) → w
14. Vector((0, 0), (x(Corner[2]), 0)) → z
15. Sequence(Segment[(0.75 * i, 0), (0.75 * i, -0.025)], i, 1, 4) → list1
16. Vector(B - (1.2, 0), B + (1.2, 0)) → v
17. Sequence(Segment[(0, 0.5 * i - 1), (-0.025, 0.5 * i - 1)], i, 0, 4) → list2
18. Sequence(Segment[(x(B), 0.5 * i - 1), (x(B) - 0.025, 0.5 * i - 1)], i, 0, 4) → list3
19. Sequence(Segment[B + (0.5 * i - 1, 0), B + (0.5 * i - 1, -0.025)], i, 0, 4) → list4
20. Segment(C, Q) → d
21. Function(tan(120° * x), 0, θ / (360 * γ) * 3) → f
22. Point(Ray[(0, 0), (-1, 0)]) → B_1
23. Rotate(A_1, θ, B_1) → P_1
24. Rotate(A_1, θ, B_1) → A'_2
25. Rotate(A_1, θ, B_1) → A'_3
26. Circle(B_1, A_1) → c_1