2 лаба. Матфункции

#include <iostream>
#include <cmath>
using namespace std;

double Ur1(double x, double y, double z);
double Ur2(double x, double y, double z);
double Ur3(double z);

int main()
{
    setlocale (LC_ALL, "Russian");
    double x, y, z;
    cout << "X: ";
    cin >> x;
    cout << "Y: ";
    cin >> y;
    cout << "Z: ";
    cin >> z;
    cout << "(" << x << "+" << y << "+sqrt(pow((" << x << "-" << y << "), 2)+4*(" << z << "*" << z << ")))/2 = " << Ur1(x, y, z) << endl;
    cout << y << "-sqrt((abs(" << x << ")))*(" << x << "-(" << y << "/" << z << "+(pow(" << x << ",2)/4)))= " << Ur2(x, y, z) << endl;
    cout << "cos(atan(1/" << z << "))*cos(atan(1/" << z << "))= " << Ur3(z) << endl;
}

double Ur1(double x, double y, double z)
{
    return (x + y + sqrt(pow((x - y), 2) + 4 * (z*z)))/2;
}

double Ur2(double x, double y, double z)
{
    return y - sqrt((abs(x)))*(x - (y / z + (pow(x, 2) / 4)));
}

double Ur3(double z)
{
    return cos(atan(1 / z))*cos(atan(1 / z));
}