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exp_2: Test

# include <cmath>           // define fabs function
# include "exp_2.hpp"       // definition of exp_2 algorithm
bool exp_2(void)
{    double x     = .5;
     double check = 1 + x + x * x / 2.; 
     bool   ok    = std::fabs( exp_2(x) - check ) <= 1e-10; 
     return ok;
}

Input File: introduction/exp_apx/exp_2.omh