? RPL/HP-48 - numerical S on a << >> integrand ?

[Werner]

You can use
\<< <-X SIN <-X SQ - \>> 'F' STO
0.
1.
'F'
'<-X'
S

with <- the backarrow symbol, declaring a local variable.

If you don't like that, you'll have to do it the way Olidabel did

Cheers, Werner