Java.lang.Math.atan() Method

Description

The java.lang.Math.atan(double a) returns the arc tangent of an angle, in the range of -pi/2 through pi/2. Special cases:

• If the argument is NaN, then the result is NaN.

• If the argument is zero, then the result is a zero with the same sign as the argument.

A result must be within 1 ulp of the correctly rounded result. Results must be semi-monotonic.

Declaration

Following is the declaration for java.lang.Math.atan() method

public static double atan(double a)

Parameters

• a -- the value whose arc tangent is to be returned.

Return Value

This method returns the arc tangent of the argument.

Exception

• NA

Example

The following example shows the usage of lang.Math.atan() method.

package com.tutorialspoint;

import java.lang.*;

public class MathDemo {

   public static void main(String[] args) {

      // get a variable x which is equal to PI/2
      double x = Math.PI / 2;

      // convert x to radians
      x = Math.toRadians(x);

      // get the arc tangent of x
      System.out.println("Math.atan(" + x + ")" + Math.atan(x));
   }
}

Let us compile and run the above program, this will produce the following result:

Math.atan(0.027415567780803774)0.0274087022410345