r

x

y

cos(\alpha) = \frac{\text{Ankathete}}{\text{Hypothenuse}} = \frac{x}{r}

C: (1 | 0)
O: (0 | 0)
K = Point(yAxis)
h = Circle(O, K)
P = Point(h)
f = Segment(O, P)
g = OrthogonalLine(P, xAxis)
A = Intersect(g, xAxis)
i = Segment(O, A)
j = Segment(A, P)
α = Angle(C, O, P)
a: cos(α)
k = Segment(O, C)
Text2: "x = \underbrace{r}_{" + (LaTeX[f]) + "} \cdot \underbrace{cos(\alpha)}_{" + (LaTeX[a]) + "}= " + (LaTeX[x(A)]) + ""