.Cos()

Published Mar 25, 2023
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The `Math.Cos()` class method returns the cosine of a given angle.

Syntax

``````Math.Cos(angle);
``````

The `Math.Cos()` method takes only one parameter, `angle`, an angle in radians of type `double`. The method returns the cosine of the `angle` as a `double` value or `NaN` (not a number) if the value of `angle` equals:

• `NaN`
• `NegativeInfinity`
• `PositiveInfinity`

Example

The following example first converts `60` degrees to radians, then uses the `Math.Cos()` method to return the sine of that angle. Finally, the `Console.WriteLine()` function prints the result to the console:

```using System;
public class Example {  public static void Main(string[] args) {    double degrees = 60;    double radians = degrees * Math.PI/180;
Console.WriteLine("The cosine of " + degrees + " degrees is: " + cosine);  }}
```

The example will result in the following output:

```The cosine of 60 degrees is: 0.5
```

Codebyte Example

The following example is runnable and returns the cosine of the `angle` given in degrees:

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