C# .SinCos()

The Math.SinCos() method returns both the sine and cosine of a specified angle (in radians) as a tuple.

Syntax

Math.SinCos(angle);

Parameters:

• angle: A double-precision floating-point number representing an angle in radians.

Return value:

The method returns a tuple containing both the sine and cosine of the angle as double values. If the value of angle equals NaN, NegativeInfinity, or PositiveInfinity, the method returns NaN for both values.

Note: This method is more efficient than calling Math.Sin() and Math.Cos() separately when both values are needed.

Example 1

In this example, the code converts 45 degrees to radians and uses the Math.SinCos() method to return both the sine and cosine of that angle:

using System;

public class Example {
  public static void Main(string[] args) {
    double degrees = 45;
    double radians = degrees * Math.PI/180;

    var (sine, cosine) = Math.SinCos(radians);

    Console.WriteLine("The sine of " + degrees + " degrees is: " + sine);
    Console.WriteLine("The cosine of " + degrees + " degrees is: " + cosine);
  }
}

Copy to clipboard
Copy to clipboard

The example will result in the following output:

The sine of 45 degrees is: 0.7071067811865476
The cosine of 45 degrees is: 0.7071067811865476

Copy to clipboard
Copy to clipboard

Example 2

In this example, both sine and cosine values of a 30° angle are calculated using Math.SinCos():

using System;

public class Example {

  public static void Main(string[] args) {
    // Angle in degrees
    double angle = 30;

    var (sine, cosine) = Math.SinCos(angle * Math.PI/180);

    Console.WriteLine("The sine of " + angle + " degrees is: " + sine);
    Console.WriteLine("The cosine of " + angle + " degrees is: " + cosine);
  }
}

Copy to clipboard
Copy to clipboard

The output of this code is:

The sine of 30 degrees is: 0.5
The cosine of 30 degrees is: 0.8660254037844386

Copy to clipboard
Copy to clipboard

Note: The Math.SinCos() method is supported starting from .NET 6 and later. It is not available in earlier .NET versions.