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

#define MULT 0.5
int main (int argc, char *argv[]) {
  float x,y,r;
  float delta;
  int i = 0;
  if (argc != 2) {
    fprintf (stderr, "wrong number of arguments (one expected)\n");
    exit (1);
  }
  sscanf(argv[1],"%f", &x);
  delta = 0.1;
  while (delta != 0) {
    y = (sin(delta+x) - sin(x)) / delta;
    printf("%d: x=%.24f, sin(x)\'=%.24f,cos(x)=%.24f\n",i,x,y,cos(x));;
    delta = delta*MULT;
    i++;
  }
}