#define _USE_MATH_DEFINES
#include <math.h>
#include <iostream>
using namespace std;

double sh( double x )
{
    return (exp(x)-exp(-x))/2;
}

int _tmain(int argc, _TCHAR* argv[])
{
    setlocale(0, ".1251");
    double x, n;
    cout << "Введите x: "; cin >> x;
    n = sh(x)*tan(x+1)-pow(M_PI/2 - atan(2+sh(x-1)), 2);
    cout << "n = " << n << endl;
    system("PAUSE");
    return 0;
}