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C++

#include <unsupported/Eigen/MatrixFunctions>
#include <iostream>
using namespace Eigen;
int main() {
const double pi = std::acos(-1.0);
MatrixXd A(2, 2);
A << cos(pi / 3), -sin(pi / 3), sin(pi / 3), cos(pi / 3);
std::cout << "The matrix A is:\n" << A << "\n\n";
std::cout << "The matrix square root of A is:\n" << A.sqrt() << "\n\n";
std::cout << "The square of the last matrix is:\n" << A.sqrt() * A.sqrt() << "\n";
}