Java - Math.cos() Method

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Description

The java.lang.Math.cos(double a) returns the trigonometric cosine of an angle. Special Cases:

• 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.

Syntax

public static double cos(double d)

Parameters

Here is the detail of parameters −

• d − A double data type.

Return Value

• This method returns the cosine of the specified double value.

Example 1

In this example, we're showing the usage of Math.cos() method to get the cos of a double number. We've created a double variable x and initialized it with a given angle. Then using Math.toRadians() method we're retrieving the radian and then using Math.cos() method we've printed the cos value.

public class Test {
   public static void main(String args[]) {
      double degrees = 45.0;
      double radians = Math.toRadians(degrees);

      System.out.format("The value of pi is %.4f%n", Math.PI);
      System.out.format("The cosine of %.1f degrees is %.4f%n", degrees, Math.cos(radians));
   }
}

This will produce the following result −

Output

The value of pi is 3.1416
The cosine of 45.0 degrees is 0.7071

Example 2

In this example, we're showing the usage of Math.cos() method to get the cos of a float number. We've created a float variable x and initialized it with a given angle. Then using Math.toRadians() method we're retrieving the radian and then using Math.cos() method we've printed the cos value.

public class Test {
   public static void main(String args[]) {
      float degrees = (float)45.0;
      double radians = Math.toRadians(degrees);

      System.out.format("The value of pi is %.4f%n", Math.PI);
      System.out.format("The cosine of %.1f degrees is %.4f%n", degrees, Math.cos(radians));
   }
}

This will produce the following result −

Output

The value of pi is 3.1416
The cosine of 45.0 degrees is 0.7071

Example 3

In this example, we're showing the usage of Math.cos() method to get the cos of a zero value. We've created a float variable x and initialized it with a given angle for zero value. Then using Math.toRadians() method we're retrieving the radian and then using Math.cos() method we've printed the cos value.

public class Test {
   public static void main(String args[]) {
      float degrees = (float)0.0;
      double radians = Math.toRadians(degrees);

      System.out.format("The value of pi is %.4f%n", Math.PI);
      System.out.format("The cos of %.1f degrees is %.4f%n", degrees, Math.cos(radians));
   }
}

This will produce the following result −

Output

The value of pi is 3.1416
The cos of 0.0 degrees is 1.0000