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

int main() {
  long double EPS = 0;
  long double EP = 1, ep = 1;
  long double x = 0;
  printf("Enter EPS(0 < EPS < 1) = ");
    if(scanf("%Lf", &EPS) != 1)
    {
        printf("Error.\n");
        return 0;
    }
  printf("Enter x = ");
    if(scanf("%Lf", &x) != 1)
    {
        printf("Error.\n");
        return 0;
    }
    int k = 1;
  long double y = 1;
  long double powx = x*x*(-1);
  int factorial = 2;
  int f = 2;
  if(EPS >= 1 || EPS <= 0)
  {
    printf("Error EPS.\n");
    return 0;
  }
  printf("cos(x) = %f;\n", cos(x));
  while(k < 10)
  {
    EP = powx/factorial;
    y = y + EP;
    powx = powx*x*x*(-1);
    factorial = factorial*(f + 1)*(f + 2);
    f = f + 2;
    k++;
    printf("EP = %1.25Lf\n", EP);
  }
  printf("Teilor = %Lf\n", y);



  return 0;
}