text: #include <matplot/matplot.h>
  
  int main() {
      using namespace matplot;
  
      fimplicit([](double x, double y) { return pow(x, 2) + pow(y, 2) - 3; },
                std::array<double, 4>{-3, 0, -2, 2});
  
      wait();
      return 0;
  }