cos α

cos

tan (x)

cos(x)

q: x = -2
D: (-1, 0)
eq2: (x + 02)^(2) + y^(2) = 1
A = Point(eq2)
r = OrthogonalLine(A, q)
A_y = Intersect(r, q)
s = Segment(A, A_y)
O_{1}: (-2, 0)
c = CircleArc(O_{1}, D, A)
O: (0; 0)
α = Angle(O, O_{1}, A)
Y: (c, If[270° > α > 90°, (-s), s])
f: y = tan(x)
eq1: x^(2) - y^(2) = 1
g = Tangent(A, eq2)
B = Intersect(g, xAxis)
C: (x(Y), 0)
h = Segment(A, B)
i = Segment(O_{1}, A)
j = Segment(B, O_{1})
p: y = tan(x)
k = OrthogonalLine(A, j)
eq3: x = -2
l = OrthogonalLine(A, eq3)
m = Segment(A, D)
A_x = Intersect(k, j)
n = Segment(A, A_x)
T: (α, If[0° < α < 180°, n, (-n)] / If[90° > α < (-(300°)), m, (-m)])
tekst1: "cos " + α + " = " + s + ""
t = Segment(Y, C)
E = Point(c)