/* C program to find the sum of cos(x) series */

#include  < stdio.h>
#include  <math.h>

void main()
{
int n,x1,i,j;
float x,sign,cosx,fact;

printf(“Enter the number of the terms in aseries\n”);
scanf(“%d”,&n);

printf(“Enter the value of x(in degrees)\n”);
scanf(“%f”,&x);

x1=x;

x=x*(3.142/180.0); /* Degrees to radians*/

cosx=1;

sign=-1;

for(i=2;i<=n;i=i+2)
{
fact=1;

for(j=1;j<=i;j++)
{
fact=fact*j;
}

cosx=cosx+(pow(x,i)/fact)*sign;
sign=sign*(-1);
}

printf(“Sum of the cosine series = %7.2f\n”,cosx);
printf(“The value of cos(%d) using library function = %f\n”,x1,cos(x));

} /*End of main() */

/*——————————————————–
Output
Enter the number of the terms in aseries
5
Enter the value of x(in degrees)
60
Sum of the cosine series = 0.50
The value of cos(60) using library function = 0.499882
——————————————————–*/

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