/* Write a 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; //accepts floating values
printf("Enter the number of the terms in a series\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 a series
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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