trig

   x

   x

x

b = 0.004999999999999893
a = 1
t = 0 rad (slider from 0 to 6.283185307179586, step 0.0080)
B: (1; a t + b)
d = Circle((0, 0), (1, 0))
c = 0
e: log(sgn(y(B) - c) exp(1))
A: (1; t)
f: log(-sgn(y(B) + c) exp(1))
C: (x(A), f y(A))
D: (x(A), e y(A))
E = (0.8660254037844387, 0.49999999999999994)
F = (0.7071067811865476, 0.7071067811865475)
G = (0.5000000000000001, 0.8660254037844386)
H = (6.123233995736766E-17, 1)
I = (-0.4999999999999998, 0.8660254037844387)
J = (-0.7071067811865475, 0.7071067811865476)
K = (-0.8660254037844387, 0.49999999999999994)
L = (-1, 1.2246467991473532E-16)
M = (-0.8660254037844388, -0.4999999999999997)
N = (-0.7071067811865477, -0.7071067811865475)
O = (-0.5000000000000004, -0.8660254037844385)
P = (-1.8369701987210297E-16, -1)
Q = (0.5000000000000001, -0.8660254037844386)
R = (0.7071067811865474, -0.7071067811865477)
S = (0.8660254037844384, -0.5000000000000004)
T = (1, 0)
β = Angle((1; 0 rad), (0, 0), A)
u = Vector((f x(B), 0), B)
v = Vector((e x(B), 0), B)
T1: " " + a + "x + " + b
T4: "ax + b = " + (a t + b)