What is Math.Acos() in C#?

C# has a built-in Math class that provides useful mathematical functions and operations. The Math class has the Acos() function, which is used to compute the angle whose cosine comes out to be a specified number. This is also known as the inverse cosine of a specified number.

Syntax

public static double Acos (double value);

Parameters

  • value: value is of the Double type and represents the input value, which is determined by finding Acos(). Its range must be:

    • -1 <= value <= 1

Return value

  • Double: Acos() returns an angle Θ measured in radians, and of type Double, whose cosine is value.

    • 0 <= Θ <= π (radians)

    It is true only for a valid range of value.

  • NaN: Acos() returns NaN for an invalid range of value.

Radians can be converted into degrees by multiplying radians by 180/Math.PI.

Example

using System;

class Educative

{

    static void Main()

    {

        Double result = Math.Acos(0);

        System.Console.WriteLine("Acos(0) = "+ result + " radians");



        Double result1 = Math.Acos(1);

        System.Console.WriteLine("Acos(1) = "+ result1 + " radians");



        Double result2 = Math.Acos(-1);

        System.Console.WriteLine("Acos(-1) = "+ result2 + " radians");



        Double result3 = Math.Acos(2);

        System.Console.WriteLine("Acos(2) = "+ result3);

    }

}

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