Double - Cosh

Returns the hyperbolic cosine of the specified angle.

Try it

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());
	}
}

View Source 
using System;

public static partial class Extensions
{
    /// <summary>
    ///     Returns the hyperbolic cosine of the specified angle.
    /// </summary>
    /// <param name="value">An angle, measured in radians.</param>
    /// <returns>The hyperbolic cosine of . If  is equal to  or ,  is returned. If  is equal to ,  is returned.</returns>
    public static Double Cosh(this Double value)
    {
        return Math.Cosh(value);
    }
}