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StrictMath atan() Method in Java

Last Updated : 29 Dec, 2021

The

is an inbuilt method of StrictMath class which is used to return the tangent of a given argument. It returns the angle is within the range of

and

. It gives rise to two special results:

• The output is NaN if the passed parameter is a NaN.
• If the passed argument is 0, then the result is also a 0 retaining the same sign as the argument.

public static double atan(double num)

The method accepts one parameter

of double type and refers to the value whose tangent is to be returned.

The method returns the arc tangent value of the argument.

Input: num = 0.61
Output: 0.5477400137159024

Input: num = 0.0
Output: 0.0

Input: num = -71.0
Output: -1.5567127509720364

Below programs illustrate the java.lang.StrictMath.atan() method:

// Java program to illustrate the
// java.lang.StrictMath.atan()
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        double num1 = 0.70, num2 = 55.00, num3 = 0;

        double atanValue = StrictMath.atan(num1);
        System.out.println("The arc tangent of " + 
                         num1 + " = " + atanValue);

        atanValue = StrictMath.atan(num2);
        System.out.println("The arc tangent of " + 
                         num2 + " = " + atanValue);

        atanValue = StrictMath.atan(num3);
        System.out.println("The arc tangent of " + 
                          num3 + " = " + atanValue);
    }
}

The arc tangent of 0.7 = 0.6107259643892086
The arc tangent of 55.0 = 1.5526165117219184
The arc tangent of 0.0 = 0.0

// Java program to illustrate the
// java.lang.StrictMath.atan()
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        double num1 = -0.52, num2 = -71.00, num3 = 0;

        double atanValue = StrictMath.atan(num1);
        System.out.println("The arc tangent of " + 
                           num1 + " = " + atanValue);

        atanValue = StrictMath.atan(num2);
        System.out.println("The arc tangent of " + 
                            num2 + " = " + atanValue);

        atanValue = StrictMath.atan(num3);
        System.out.println("The arc tangent of " + 
                            num3 + " = " + atanValue);
    }
}

The arc tangent of -0.52 = -0.4795192919925962
The arc tangent of -71.0 = -1.5567127509720364
The arc tangent of 0.0 = 0.0

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