Java.lang.Math.cos() Method

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Description

The java.lang.Math.cos(double a) returns the trigonometric cosine of an angle.If the argument is NaN or an infinity, then the result is NaN.The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.

Declaration

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

public static double cos(double a)

Parameters

a − an angle, in radians

Return Value

This method returns the cosine of the argument.

Exception

NA

Example

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

package com.tutorialspoint;

import java.lang.*;

public class MathDemo {

   public static void main(String[] args) {

      // get two double numbers
      double x = 45.0;
      double y = 180.0;
   
      // convert them to radians
      x = Math.toRadians(x);
      y = Math.toRadians(y);

      // print their cosine
      System.out.println("Math.cos(" + x + ")=" + Math.cos(x));
      System.out.println("Math.cos(" + y + ")=" + Math.cos(y));
   }
}

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

Math.cos(0.7853981633974483)=0.7071067811865476
Math.cos(3.141592653589793)=-1.0