public static double atanh(double d) {return Math.log((1 + d)/(1 - d)) / 2;}

public static double atanh ( double d ) { return Math . log ( ( 1 + d ) / ( 1 - d ) ) / 2 ; }
public static double Atanh(double d){return Math.Log((1 + d) / (1 - d)) / 2;}
