75         $ret = $this->handleFunction($ret, 'sqrt', 1);
76         $ret = $this->handleFunction($ret, 'vec', 1);
77         $ret = $this->handleFunction($ret, 'overline', 1);
78         $ret = $this->handleFunction($ret, 'underline', 1);
79         $ret = $this->handleFunction($ret, 'hat', 1);
80         $ret = $this->handleFunction($ret, 'int', 3);
81         $ret = $this->handleFunction($ret, 'doubleint', 3);
82         $ret = $this->handleFunction($ret, 'tripleint', 3);
83         $ret = $this->handleFunction($ret, 'oint', 3);
84         $ret = $this->handleFunction($ret, 'prod', 3);
85         $ret = $this->handleFunction($ret, 'sum', 3);
86         $ret = $this->handleFunction($ret, 'bigcup', 3);
87         $ret = $this->handleFunction($ret, 'bigcap', 3);
88         $ret = $this->handleFunction($ret, 'delim', 3);
89         $ret = $this->handleFunction($ret, 'lim', 2);
90         $ret = $this->handleFunction($ret, 'root', 2);
91         $ret = $this->handleFunction($ret, 'matrix', 3);
92         $ret = $this->handleFunction($ret, 'tabular', 3);
140     public function handleFunction(array $nodes, $function, $argumentsCount)  function in RL\\PhpMathPublisher\\MathExpression