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The C# Math Asin() method is used to return arc sine of a value. The return value will be in the range -𝜋/2 through 𝜋/2. In special cases it returns the following:

  • If the argument is NaN or its absolute value is greater than 1, the method returns NaN.

Note: Asin() is the inverse of sin().

Syntax

public static double Asin(double arg);

Parameters

arg Specify the value.

Return Value

Returns the arc sine of the value.

Example:

In the below example, Asin() method is used to find out the arc sine of a given value.

using System;

class MyProgram {
  static void Main(string[] args) {
   Console.WriteLine(Math.Asin(0.5));
   Console.WriteLine(Math.Asin(1));
   Console.WriteLine(Math.Asin(2));
  }
}

The output of the above code will be:

0.523598775598299
1.5707963267949
NaN

❮ C# Math Methods