\starttext
\startitemize
\item U+02B9 MODIFIER LETTER PRIME
\startformula
f(x) = x ⇒ fʹ(x) = 1
\stopformula

\item U+2032 PRIME
\startformula
f(x) = x ⇒ f′(x) = 1
\stopformula

\item \backslash prime
\startformula
f(x) = x ⇒ f\prime(x) = 1
\stopformula
\stopitemize
\stoptext