#include <iostream>
#include <cmath>
using namespace std;
int main()
{
double b, x, y, z, k;
cin >> x;
cin >> y;
cin >> z;
k=y-5;
if( k == 0) //числитель равен 0
{
cout << "решений нет "<< endl;
}
else
{
b=x-(pow(z,2)*pow(cos(x),4)/(y-5))-1/8-pow(cos(x),0.2);
cout<<"b="<<b<<endl;
}
// your code goes here
return 0;
}
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