<<< native
[ EText TextNormal "The same expression\160"
, EGrouped
    [ EDelimited
        "["
        "]"
        [ Right
            (EFraction
               NormalFrac
               (EGrouped
                  [ EDelimited
                      ""
                      ""
                      [ Left "\8741"
                      , Right
                          (EFraction
                             NormalFrac
                             (EGrouped
                                [ EGrouped
                                    [ EMathOperator "sin"
                                    , ESymbol Ord "\8289"
                                    , EIdentifier "\952"
                                    ]
                                , ESymbol Bin "+"
                                , ENumber "1"
                                ])
                             (ENumber "11"))
                      , Left "\8741"
                      ]
                  , ESymbol Bin "-"
                  , EIdentifier "x"
                  ])
               (EFraction
                  NormalFrac
                  (ESuper (EIdentifier "x") (ENumber "2"))
                  (ESub (EIdentifier "a") (ENumber "1"))))
        ]
    , ESymbol Bin "+"
    , EGrouped [ ESymbol Open "[" , ENumber "1.0" , ESymbol Close "]" ]
    ]
, EText TextNormal "\160in a display."
]
>>> eqn
roman "The same expression " {left [ {left "" "∥" {{sin  theta} + 1} over 11 "∥" right "" - x} over {{x sup 2} over {a sub 1}} right ] + {[ 1.0 ]}} roman " in a display."