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whats wrong with my code? gets WA but matches the in/outs in this forum

#include <iostream>
#include <stdio.h>
#include <cmath>
#define verysmall pow(10,-9)
using namespace std;
double N1,N2;
string s="";
int recur(double m,double n,double m1,double n1)
{
double numerator=m+m1;
double ...