সি++ atan2 গণিত

#include <cmath>
#include <iostream>

int main() {
    std::cout << std::atan2(0.5, 0.4) << std::endl;
    std::cout << std::atan2(0.5, 0.5) << std::endl;
    std::cout << std::atan2(0.5, 0.6) << std::endl;
}