α

COSINE WAVE
Use slider to change the value of α.
Use COMMAND-Z to erase the trace.

Point represents "directed" AC vs. angle α.

α = 0.5235987755982988 rad (slider from 0 to 360°, step °)
A = Point(xAxis)
c = Circle(A, 1)
M, D = Intersect(c, xAxis)
B = Rotate(D, α, A)
β = Angle(D, A, B)
a = Ray(A, B)
b = OrthogonalLine(B, xAxis)
C = Intersect(b, xAxis)
d = Segment(B, C)
S: (α, x(B) + 3)
n_1: x(B) + 3
text2: "AC = " + n_1 + ""