11

#include<iostream.h>
#include<math.h>

void main ()
{
	double x;
	double jomleh; // baraaye inke...
	double chandJomleyi=0;
	int tedadJomleh, i=1;

	cout << "x=";
	cin >> x;
	cout << "taa chand jomle?";
	cin >> tedadJomleh;
	chandJomleyi = jomleh = x;
	i = 2;
	while (i<2*tedadJomleh+1) {
		jomleh *= -1 * x * x 
			      /
				  (i*(i+1));
		chandJomleyi += jomleh;
		i+=2;
	}

	cout << "meghdare tabe'= "
		<< chandJomleyi << endl;
}