tan xのグラフと円の関係

tan xのグラフと円の関係を調べよう。

y=\tan xのグラフと\
円の関係

a_1 = 1.08341 (slider from -3.14159 to 3.14159, step 0.025)
A: (cos(a_1), sin(a_1))
B: (a_1, 0)
C: (a_1, tan(a_1))
b = Segment(B, C)
D = Intersect(c, aa, 1)
E = Intersect(xAxis, yAxis)
a = CircleArc(E, D, A)
d = CircleArc(E, A, D)
e = Line(E, A)
F = Intersect(aa, e)
f = Segment(F, D)
g = Segment(B, E)
h = Segment(F, C)