// C# Extension Method
// Doc: https://csharp-extension.com/en/method/1002327/double-cosh
// @nuget: Z.ExtensionMethods
using System;
public class Program
{
public static void Main()
double[] doubles = { 0, 45, 90, 180 };
foreach (double value in doubles)
double radians = (value * (Math.PI)) / 180;
// C# Extension Method: Double - Cosh
Console.WriteLine("Cosh({0}) = {1}", value, radians.Cosh());
}