f(x) = sin(x) + 3
A = Point(f)
tangente = Tangent(A, f)
m = Slope(tangente)
B: (x(A), m)
a = OrthogonalLine(B, xAxis)
C = Intersect(a, xAxis)
b = Segment(C, B)
c = Distance(B, C)
T1: "" + (y(B))
f' = Derivative(f)