# Double - Atan

Returns the angle whose tangent is the specified number.

public static void Main()
{

double angle;
double result;

// Calculate the tangent of 30 degrees.
angle = 30;
radians = angle * (Math.PI / 180);

// C# Extension Method: Double - Tan
Console.WriteLine("The tangent of 30 degrees is {0}.", result);

// Calculate the arctangent of the previous tangent.

// C# Extension Method: Double - Atan
angle = radians * (180 / Math.PI);
Console.WriteLine("The previous tangent is equivalent to {0} degrees.", angle);
}

View Source
using System;

public static partial class Extensions
{
/// <summary>
///     Returns the angle whose tangent is the specified number.
/// </summary>
/// <param name="d">A number representing a tangent.</param>
/// <returns>
///     An angle, ?, measured in radians, such that -?/2 ????/2.-or-  if  equals , -?/2 rounded to double precision (-
///     1.5707963267949) if  equals , or ?/2 rounded to double precision (1.5707963267949) if  equals .
/// </returns>
public static Double Atan(this Double d)
{
return Math.Atan(d);
}
}