math++
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#include <iostream>
#include <iomanip>
#define _USE_MATH_DEFINES
#include<cmath>
using namespace std;
long double pi = 3.141592653589793;
int main() {
double x, y, z, w;
cout << std::setprecision(16) << M_PI << endl << pi << endl << sin(M_PI/2) << endl;
cout << hypot(3,4) << endl << pow(4,0.5) << endl;
}
Cpp
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