正切函数与单位圆 - 弧度制

GeoGebra 命令及参数

1. Line(B, O) → a
2. Circle(O, 1) → c
3. Intersect(c, a, 2) → C
4. Rotate(C, α, O) → D
5. CircleArc(O, J, D) → k
6. Angle(C, O, D) → β
7. Segment(O, D) → b
8. Distance(D, a) → d
9. OrthogonalLine(D, a) → e
10. Intersect(a, e) → A
11. Length(k) → RadianAlpha
12. Segment(D, A) → g
13. Segment(A_1, D_1) → h
14. Midpoint(D, A) → E1
15. Midpoint(A_1, D_1) → F
16. Point(xAxis) → G
17. Segment(G, A_1) → i
18. Intersect(c, a, 2) → H
19. Intersect(c, a, 1) → I
20. Segment(I, H) → j
21. Segment(O, A) → l
22. Midpoint(O, A) → E2
23. Polygon(E, K, L, M) → poly1, e_1, k_1, l_1, m