<<< native [ EIdentifier "u" , ESymbol Ord "\8243" , ESymbol Bin "+" , EIdentifier "p" , EDelimited "(" ")" [ Right (EIdentifier "x") ] , EIdentifier "u" , ESymbol Ord "\8242" , ESymbol Bin "+" , EIdentifier "q" , EDelimited "(" ")" [ Right (EIdentifier "x") ] , EIdentifier "u" , ESymbol Rel "=" , EIdentifier "f" , EDelimited "(" ")" [ Right (EIdentifier "x") ] , ESymbol Pun "," , ESpace (1 % 1) , EIdentifier "x" , ESymbol Rel ">" , EIdentifier "a" ] >>> eqn u \[u2033] + p left ( x right ) u prime + q left ( x right ) u = f left ( x right ) , fwd 100 x > a