Hello,
I am now using the lmtx engine and I have found that using the Pagella font the writing of derived functions is not very nice with the symbol '.
Thank you.
Fabrice

\setupbodyfont [pagella,11pt]
\starttext
\startitemize[n]
  \startitem
    \math{f'(x)=x²+4x+4}
  \stopitem
  \startitem
     \math{f''(x)=2x+4}
  \stopitem
\stopitemize
\stoptext