Java Math cos() Method

The cos() method of Math class returns the trigonometric cosine of the specified angle.

Syntax:

public static double cos(double a)

Parameters:

The parameter ‘a’ represents an angle measured in radians.

Return Value:

The cos() method returns the cosine of the argument. It returns NaN, for NaN or infinity argument.

Example 1:

public class JavaMathCosExample1 {
    public static void main(String[] args) {
        double a=90;
        //return the cosine value for a
        System.out.println("Cosine value : "+Math.cos(a));
    }
}

Output:

Cosine value : -0.4480736161291702

Example 2:

public class JavaMathCosExample2 {
    public static void main(String[] args) {
        double a=-0.0d/0.0d;
        //returns NaN, if argument is NaN
        System.out.println("Cosine value for "+a+" = "+Math.cos(a));
    }
}

Output:

Cosine value for NaN = NaN

Example 3:

public class JavaMathCosExample3 {
    public static void main(String[] args) {
        // Returns NaN as Math.PI value is 3.414 that is greater than 1
        double x = Math.PI;
        System.out.println("Cosine value for "+x+" = "+Math.asin(x));
    }
}

Output:

Cosine value for 3.141592653589793 = NaN

Example 4:

public class JavaMathCosExample4 {
    public static void main(String[] args) {
        //return a cosine value for negative Infinity
        double x = -90d/0.0d;
        System.out.println("Cosine value for "+x+" = "+Math.cos(x));
    }
}

Output:

Cosine value for -Infinity = NaN