#include "stdafx.h"
#include <stdexcept>
#include <limits>

extern "C" __declspec(dllexport)
double myf_math(double a, double x)
{
	return 1 / sqrt(1 - x);
}

extern "C" __declspec(dllexport)
double myf_1(double eps, double a, double x)
{
	if (x >= 1)
		return std::numeric_limits<double>::infinity();
	double sum = 1, q = 1;
	for (int n = 1; fabs(q) >= eps; n++)
	{
		q *= (2 * n - 1)*x / 2 / n;
		sum += q;
	}
	return sum;
}

extern "C" __declspec(dllexport)
const char* FName()
{
	return "1/sqrt(1-x)";
}