//!require(lib_fx.js) 


//Expression syntax see:
//https://silentmatt.com/javascript-expression-evaluator/

function main() {
  //var fx = new FX("2 * x + 1 + atan(x)");
  var fx = new FX("atan(x)");

  fx.calc(50);
  //fx.showGraph(false);

  return JSON.stringify(fx);
}