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

#include "nr.h"

double function(double x)
{
	return pow(sin(x),3)+pow(cos(x),2);

}

int main()
{
	double tol = 1.0e-12;
	double x1=-1,x2=1;
	double ans;

	ans = zbrent(function, x1, x2, tol);
	printf("%lf\n",ans);

	return 0;
}