f(x) = x
a = 2.7 (slider from 0 to 3, step 0.1)
g(x) = tanh((a * x))
h(x) = g(x) - f(x)
A = Intersect(g, f, (4.95130402782537E-16, 1.332267629550186E-15))
B = Intersect(g, f, (0.9905382851914443, 0.9905382851901373))
C = Intersect(f, g, (-0.990538285192879, -0.990538285192879))