Hi Hans,
The macro that you proposed me worked very well but since my update of context standalone, it does not work any more.
Thank you.
Fabrice

\setupmathextensible[integral][rightoffset=-3mu,exact=yes,factor=2] 

\unexpanded\def\integ#1#2#3{\math{\autointegral{#1}{#2}{#3}\diff x}}

\starttext
\integ{4}{1}{f(x)}
\stoptext