C# | Math.Atan() Method

Math.Atan() is an inbuilt Math class method which returns the angle whose tangent is given as a double value argument. If the argument is NaN, then the result will be NaN.

Syntax:

public static double Atan(double num)

Parameter:

num: It is the number that represents a tangent and type of this parameter is System.Double.

Return Type: Returns an angle Θ, measured in radians and its type is System.Double. Here the angle is always measured in radians, such that -π/2 ≤ Θ ≤ π/2.

Examples:

Input  : Math.Atan(1)
Output : 0.785398163397448

Input  : Math.Atan(0.0)
Output : 0

Input  : Math.Atan(-0.0)
Output : 0

Input  : Math.Atan(Double.PositiveInfinity)
Output : 1.5707963267949

Input  : Math.Atan(Double.NegativeInfinity)
Output : -1.5707963267949

Program: To illustrate the Math.Atan() method

 // C# program to demonstrate working // of Math.Atan() method using System;    class Geeks {        // Main Method     public static void Main(String []args)     {         double a = Math.PI;                    // using Math.Atan() method          Console.WriteLine(Math.Atan(a));            double d = 0.0;         double e = -0.0;         double posi = Double.PositiveInfinity;         double nega = Double.NegativeInfinity;         double nan = Double.NaN;            Console.WriteLine(Math.Atan(1));            // Input positive zero         // Output positive zero         Console.WriteLine(Math.Atan(d));            // Input negative zero         // Output positive zero         Console.WriteLine(Math.Atan(e));                    // input PositiveInfinity         // Output 1.5707963267949         Console.WriteLine(Math.Atan(posi));                    // input NegativeInfinity         // Output -1.5707963267949         Console.WriteLine(Math.Atan(nega));                    // input NaN         // Output NaN         Console.WriteLine(Math.Atan(nan));     } }

Output:

1.26262725567891
0.785398163397448
0
0
1.5707963267949
-1.5707963267949
NaN

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