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In LaTeX you have a command like \left(\right) to enlarge the brackets proportional to the content between the brackets.

for instance \left(a\right) will produce smaller brackets than \left(\displaystyle\frac{a}{b^n}\right)

Is there a similar trick for the integral sign?

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Perhaps related: How can I have a bigger integral (\int) delimiter? – Werner May 28 '12 at 20:26
Please, don't: it's awful. – egreg May 28 '12 at 20:27
@egreg: MS Office does that (if the OpenType math font supports it) and some people seem to think it makes it better than TeX... – Khaled Hosny May 28 '12 at 20:28
@egreg: It's not my idea (I'm asking this for someone I know :D). And perhaps this is indeed awful however one does expect LaTeX to have a general solution to this probem (so one can do this trick with other symbols) – Willem Van Onsem May 28 '12 at 20:29
I agree there are some arguments against the idea. However I am wondering if there is a general solution to the problem. For instance what if someone makes his own backets? – Willem Van Onsem May 28 '12 at 20:38
up vote 4 down vote accepted

A hacky solution using unicode-math that only works with fonts that have multiple integral sizes (e,g. Asana Math or Cambria Math), and xelatex or lualatex of course:

\setmathfont{Asana Math}

\def\delint{\Udelimiter 4 \symoperators "222B }
\def\extint#1{\left\delint #1\right.}
\extint{\frac{\sum^{a+b}}{\sum_{x+y}}} \int

enter image description here

Integral indices are broken, though (needs more thought).

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