<<< native [ ESubsup (ESymbol Op "\8749") (ENumber "0") (ENumber "1") , EIdentifier "f" , EDelimited "(" ")" [ Right (EIdentifier "x") ] , ESpace (1 % 9) , ESymbol Ord "\8518" , EIdentifier "x" ] >>> eqn \[u222D] sub 0 sup 1 f left ( x right ) ^ \[u2146] x