\setuptagging[state=start]

\enabletrackers[structure.tags]

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\startparagraph

$ b = x^2 + 1 + \hbox{whatever $x$ more} + 1$
% $ b = x^2 + 1$
% $ b = x^2 + 1 + z $
% $ b = x^2 + 1 + \frac{a}{3} $
% $ \frac{aa}{3} $
% $ b = x^2 + 1 + \root{a}\of{3}\relax $
% $ b = \left( x^2 + 1 + \frac{a}{3} \right) $
% $ b = \left( x^2 + \root{3}\of{1 + \frac{a}{3}} \right) $
% $ b =  x^2 + \root{3}\of{1 + \frac{a}{3}} $
% $ b = \left( x^2 + \root{3}\of{1 + \frac{a}{3}} \right) \hbox{whatever}$

% \startbuffer
% $$ y = \left( x^2 + \root{3}\of{ax + {{b}\over{3}}} \right) ^ 2 $$
% \stopbuffer

% \typebuffer \getbuffer

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\stoptext
