/*write a c program to find value of cos(x) using the seies.*/
#include<stdio.h>
#include<math.h>
int main()
{
float x,sum,term,acc;
int i;
printf("\n Enter the value of x in degree:\n");
scanf("%f",&x);
printf("\n Enter the value of accuracy:\n");
scanf("%f",&acc);
x=3.14*x/180;
sum=0;
i=0;
term=1;
while(fabs(term)>=acc)
{
sum=sum+term;
i=i+1;
term=-term*x*x/((2*1)*(2*1-1));
}
printf("\n cos(x)=%f",sum);
printf("\n By using library function cos(x)=%f",cos(x));
return 0;
}