toLatex (Function "sqrt" [n, r]) =
    "\\sqrt[" ++ toLatex r ++ "]" ++ group (toLatex n)
toLatex (Function "sqrt" [n, r]) =
    "\\sqrt[" ++ toLatex r ++ "]" ++ group (toLatex n)
toLatex (Function "sqrt" [n, r]) =
    "\\sqrt[" ++ toLatex r ++ "]" ++ group (toLatex n)