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Method Math.atan () — returns the arc tangent of the radian value.

double atan(double d)

Detailed information about the parameters:

public class Test { 

   public static void main(String args[]) {
      double degrees = 65.0;
      double radians = Math.toRadians(degrees);

      System.out.format("The value of pi is very approximately %.4f%n", Math.PI);
      System.out.format("The arctangent of %.4f is %.4f degrees %n", Math.cos(radians), 
         Math.toDegrees(Math.atan(Math.sin(radians))));
   }
}

The value of pi is  very approximately 3.1416
The arctangent of 0.4226 is 42.1863 degrees 

Table of the main values of the arc tangent:

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