#include <iostream>
#include <math.h>
using namespace std;
int main(void)
{
	long long unsigned int r;
	int n;
	double x0, xn, dx, x, chx, chxnorm;
	cout << "X0 Xn dX" << endl;
	cin >> x0 >> xn >> dx;
	for (x = x0; x <= xn; x += dx)
	{
		cout << "X = " << x << endl;
		chx = 1;
		n = 0;
		do
		{
			n++;
			r = 1;
			int i;
			for (i = 1; i <= n * 2; i++)
				r *= i;
			chx += pow(x, 2 * n) / r;

		} while (pow(x, 2 * n) / r >= pow(10, -6));
		cout << "Ch(x) Taylor = " << chx << "  Ch(x) normal = " << cosh(x) << endl;
	}
}