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.

`/*`

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

`*/`

using System;

`namespace ConsoleApplication1`

`{`

`class Program`

`{`

static void Main(string[] args)

`{`

for (double d = 0; d < 6.0; d += 0.5)

`{`

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

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

Console.WriteLine();

`}`

Console.ReadKey();

`}`

static double cos(double x)

`{`

double p = x * x;

double q = p * p;

return 1.0 - p / 2 + q / 24 - p * q / 720 + q * q / 40320 - p * q * q / 3628800;

`}`

`}`

`}`

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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