f: y = ℯ^(x)
A = Point(xAxis)
B: (x(A), f(x(A)))
g = Segment(A, B)
text1: "d(AB)=" + (LaTeX[g]) + ""
C = Midpoint(B, A)
text2: "← A" + A + " →"
text3: " B " + B + " "