#include <iostream>
using namespace std;
doubli fi=0;
double m1=0;
double m2=0;
double m3=0;
double function(double (f)(double, double), double yi, double xi, double h)
{
double resfunc;
return yi+h*resfunc;
}
double f1(double xi, double yi)
{
return 0;
}
int main()
{
// your code goes here
return 0;
}
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