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

#define eps 1e-6

double f(double x)
{
	return (0.4*x + 0.6*cos(x));
}

int main(void)
{
	int i;
	double x=1.5, y, delta;

	do 
	{
		y=f(x);
		delta=fabs(y-x);
		x=y;
		printf("%lf \t %lf \n",x,f(x));
	} while (delta > eps);

	return 0;
}