#include <iostream>
using namespace std;
int main() {
cout <<;
return 0;
}
#include <iostream>
#include<cmath>
using namespace std;
int main()
{
double x,y, z;
cin >> x;
y = 12*pow(x,2) + 7 * x - 5;
if((sin (x) == 0)||(y == 0))
{
cout << "net rechenuu";
}
else {
z = 2 * cos (3*x)/sin (3*x) - 1/12*pow(x,2) + 7 * x - 5;
cout << z;
}
return 0;
}
#include <iostream>
#include<cmath>
using namespace std;
int main()
{
double R1, R2, z; //33
cin >> R1 >> R2;
if((R1 == 0)||(R2 == 0))
{
cout << "net rechenuu";
}
else {
z = 1/R1 + 1/R2;
cout << z;
}
return 0;
}
