Where's the inverse of Math.tanh in the math libraries?

Question

y = Math.Tanh(x) is the hyperbolic tangent of x. But I need f(y) = x. For the regular tangent there\'s Arctan, but where\'s Arctanh?

Answer 1

the Inverse HTangent is can be calc by doing Log((1 + X) / (1 – X)) / 2