h

f(x) = (1 / 2 * (ℯ^(x) + ℯ^((-x))))
k = 1.3 (slider from -5 to 5)
h(x) = (k * x^(2)) + 1
g(x) = (1 / 2 * (ℯ^(x) - ℯ^((-x))))
a = false