C# Program to Find the Value of Cos(x)

This C# Program Finds the Value of Cos(x).Here the cos value is found without using the library math function.

Here is source code of the C# Program to Find the Value of Cos(x) . The C# program is successfully compiled and executed with Microsoft Visual Studio. The program output is also shown below.

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/*
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 * C# Program to Find the Value of Cos(x)

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 */
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using System;
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namespace ConsoleApplication1
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{
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    class Program
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    {
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        static void Main(string[] args)
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        {
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            for (double d = 0; d < 6.0; d += 0.5)

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            {
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                Console.WriteLine("The cosine of {0} = {1}", d, Math.Cos(d));

                Console.WriteLine("Calculated cosine of {0} = {1}", d, cos(d));

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                Console.WriteLine();
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            }
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            Console.ReadKey(); 
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        }
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        static double cos(double x) 
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        {
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            double p = x * x; 
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            double q = p * p;
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            return 1.0 - p / 2 + q / 24 - p * q / 720 + q * q / 40320 - p * q * q / 3628800;

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        }
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    }
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}
```

Here is the output of the C# Program:

The Cosine of 0 = 1
Calculated Cosine of 0 = 1
The Cosine of 0.5 = 0.877582561890373
Calculated Cosine of 0.5 = 0.877582561889864
The Cosine of 1.5 = 0.54030230586814
Calculated Cosine of 1.5 = 0.540302303791887
The Cosine of 2.0 = 0.0707372016677029
Calculated Cosine of 2.0 = 0.0707369341169085

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