Method arctanh

MathParser/src/com/aghajari/math/Functions.java:451–453

(double x)

    }

    public static double arctanh(double x) {
        return 0.5 * Math.log((1 + x) / (1 - x));
    }

    public static double coth(double x) {
        return 1.0 / Math.tanh(x);