$ \mathscr{C}_F $

$ \mathscr{C}_f $

e = 2.718281828459045
F = Function(log((ℯ^(x) + ℯ^(-x)) / 2), 0, Infinity)
F' = Derivative(F)
f = Function((ℯ^(x) - ℯ^(-x)) / (ℯ^(x) + ℯ^(-x)), 0, Infinity)
g = Simplify(f)
O = (0, 0)