What is Math.cos() in Java?

Java has a built-in Math class, defined in the java.lang package, which contains important functions to perform basic mathematical operations. The class has the cos() method, which is used to compute a specified angle’s trigonometric cosine.

Syntax

public  static double cos(double angle);

Parameters

  • angle represents the double value, corresponding to the angle in radians, of which we have to find the cosine.

Return value

  • The function returns the double value corresponding to the trigonometric cosine of the angle.

If the value of angle is infinity or NaNnot a number, then the returned value is NaN.

Code

To convert an angle measured in degrees to an equivalent angle measured in radians, we can use the built-in method Math.toRadians(double angle_in_degrees).

import java.lang.Math;
class HelloWorld {
    public static void main( String args[] ) {
        double param = Math.toRadians(30);
        double result = Math.cos(param);
        System.out.println("cos(" + param + ") = " + result);
        
        param = Math.toRadians(45);
        result = Math.cos(param);
        System.out.println("cos(" + param + ") = " + result);
        param = Math.toRadians(60);
        result = Math.cos(param);
        System.out.println("cos(" + param + ") = " + result);
        
        param = Math.toRadians(90);
        result = Math.cos(param);
        System.out.println("cos(" + param + ") = " + result);
        result = Math.sin(Double.POSITIVE_INFINITY);
        System.out.println("cos(∞) = " + result);
        result = Math.sin(Double.NaN);
        System.out.println("cos(NaN) = " + result);
    }
}

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