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

int main() {
    float angle,x;
    float deno,numer,sum,term;
    int i,n;
    printf("enter the angle:\n");
    scanf("%f",&angle);
    printf("enter the value of n:\n");
    scanf("%d",&n);

    x=angle*M_PI/180;
    numer=x;
    deno=1;
    sum=0;
    term=numer/deno;
    for(i=1;i<=n;i++)
        {
            sum=sum+term;
             numer=-numer*x*x;
             deno=deno*(2*i)*(2*i);
    
             term=numer/deno;
            
        }
    printf("calculated value of cos(%f) is %f\n",angle,sum);
}