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Java Math cos() method with Examples

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  • Last Updated : 06 Apr, 2018
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The java.lang.Math.cos() returns the trigonometric cosine of an angle. If the argument is NaN or an infinity, then the result returned is NaN. The returned value will be in range [-1, 1].

Syntax :

public static double cos(double angle)
Parameters:
The function has one mandatory parameter angle which is in radians. 

Returns :
The function returns the trigonometric cosine of an angle.

Example 1 : To show working of java.lang.Math.cos() method.




// Java program to demonstrate working
// of java.lang.Math.cos() method
import java.lang.Math;
  
class Gfg {
  
    // driver code
    public static void main(String args[])
    {
        double a = 30;
          
        // converting values to radians
        double b = Math.toRadians(a);
  
        System.out.println(Math.cos(b));
  
        a = 45;
          
        // converting values to radians
        b = Math.toRadians(a);
  
        System.out.println(Math.cos(b));
  
        a = 60;
          
        // converting values to radians
        b = Math.toRadians(a);
  
        System.out.println(Math.cos(b));
  
        a = 0;
          
        // converting values to radians
        b = Math.toRadians(a);
  
        System.out.println(Math.cos(b));
    }
}

Output:

0.8660254037844387
0.7071067811865476
0.5000000000000001
1.0

Example 2 : To show working of java.lang.Math.cos() method when argument is NAN or infinity.




// Java program to demonstrate working
// of java.lang.Math.cos() method infinity case
import java.lang.Math; // importing java.lang package
  
public class GFG {
    public static void main(String[] args)
    {
  
        double positiveInfinity = 
               Double.POSITIVE_INFINITY;
        double negativeInfinity = 
               Double.NEGATIVE_INFINITY;
        double nan = Double.NaN;
        double result;
  
        // Here argument is negative infinity, 
        // output will be NaN
        result = Math.cos(negativeInfinity);
        System.out.println(result);
  
        // Here argument is positive infinity, 
        // output will also be NaN
        result = Math.cos(positiveInfinity);
        System.out.println(result);
  
        // Here argument is NaN, output will be NaN
        result = Math.cos(nan);
        System.out.println(result);
    }
}

Output:

NaN
NaN
NaN

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