Попробуй

#include <iostream>
#include <windows.h>
#include <cmath>

using namespace std;

int main()
{
    double z,y1,y2,x,e,min=-100;
    cin >> e;
    y2 = 1 / (cos(sin(min)));
    for(x = -100; x <= 100; x = x + e)
    {
        z = cos(sin(x));
        if(abs(z) > e)
        {
            y1 = 1 / z;
            if(abs(y1) < abs(y2))
            {
                min = x;
                y2 = y1;
            }
        }
    }
    cout << "min = " << min << endl;
    cout << "y2 = " << y2;
    return 0;
}