C# .Asin()

The Math.Asin() method computes an angle in radians whose sine is a specified number. In Math, this is known as the inverse sine function.

Syntax

Math.Asin(value);

value is the input value of type double, which must be in the range -1 <= value <= 1.

Returns an angle measured in radians, of type double, whose sine is value. If an invalid value is passed to the function, or no value is passed at all, NaN is returned.

Example

The following example prints the results of the Math.Asin() method for three different values:

using System;

public class Example
{
  static void Main()
  {
    double a = Math.Asin(0.5);
    double b = Math.Asin(1);
    double c = Math.Asin(-2);

    Console.WriteLine(a);
    Console.WriteLine(b);
    Console.WriteLine(c);
  }
}

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This results in the following output:

0.523598775598299
1.5707963267949
NaN

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