public static double acosh(double d) {return Math.log(Math.sqrt(Math.pow(d, 2) - 1) + d);}

public static double acosh ( double d ) { return Math . log ( Math . sqrt ( Math . pow ( d , 2 ) - 1 ) + d ) ; }
public static double Acosh(double d){return Math.Log(Math.Sqrt(Math.Pow(d, 2) - 1) + d);}
