C# has a built-in Math class that provides useful mathematical functions and operations. The Math class has the Atan() function, which is used to compute the angle whose tangent comes out to be a specified number.
It is also known as the inverse tangent of a specified number.
public static double Atan (double value);
value: value is of the Double type and represents the input value, which is determined by finding Atan(). Its range is all real numbers.Double: Atan() returns an angle Θ measured in radians, and of type Double, whose tangent is value.
NaN: Atan() returns NaN type for value = NaN.
-pi/2 if value is negative infinity.
pi/2 if value is infinity.
Radians can be converted into degrees by multiplying radians by 180/Math.PI.
using System;class Educative{static void Main(){Double result = Math.Atan(0);System.Console.WriteLine("Atan(0) = "+ result + " radians");Double result1 = Math.Atan(Double.PositiveInfinity);System.Console.WriteLine("Atan(∞) = "+ result1 + " radians");Double result2 = Math.Atan(400);System.Console.WriteLine("Atan(400) = "+ result2 + " radians");Double result3 = Math.Atan(Double.NegativeInfinity);System.Console.WriteLine("Atan(-∞) = "+ result3+ " radians");Double result4 = Math.Atan(Double.NaN);System.Console.WriteLine("Atan(NaN) = "+ result4);}}