Calculating cosine (in radians) using Taylor series (C++)

Calculate an approximate value cosine (in radians) using Taylor series

calculateCOSINE() calculates and returns the cosine of the given value in radians and it takes the value whose cosine is to be calculated. This function uses:

calculateFACT() to determine the factorial.

Code

#include "stdafx.h"

#include "iostream"

#include "conio.h"

#include "math.h"

using namespace std;

double calculateFACT(double number)

{

double factorial=1;

 for(int i=number;i>0;i--)

  factorial=factorial*i;

return factorial;

}

double calculateCOSINE(double m)

{

    double n=1;

       int x=1;

       for(int i=2;i<12;i=i+2)

       {

              n=n+pow(-1.0,x)*(pow(m,i))/calculateFACT(i);

              x++;

       }

return n;

}

int main()

{

       cout<< calculateCOSINE( 0.0 ) ; cout<<endl;

       cout<< calculateCOSINE( 0.1 ) ; cout<<endl;

       cout<< calculateCOSINE( 0.2 ) ; cout<<endl;

       cout<< calculateCOSINE( 0.3 ) ; cout<<endl;

       cout<< calculateCOSINE( 0.4 ) ; cout<<endl;

       cout<< calculateCOSINE( 0.5 ) ; cout<<endl;

       cout<< calculateCOSINE( 0.6 ) ; cout<<endl;

       cout<< calculateCOSINE( 0.7 ) ; cout<<endl;

       cout<< calculateCOSINE( 0.8 ) ; cout<<endl;

       cout<< calculateCOSINE( 0.9 ) ; cout<<endl;

       cout<< calculateCOSINE( 1.0 ) ; cout<<endl;

       _getche();

       return 0;

}

Output

1

0.995004

0.980067

0.955336

0.921061

0.877583

0.825336

0.764842

0.696707

0.62161

0.540302

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