To-Do
 1. Fractions
+2. Tests
 3. expression as unit's val
+4. Revisar reduce y pasar a map
+5. mk :m recurse down primero
 6. Going multiprocess
 7. Functions! Derivate! Integrate!

import Exun
import Exun.Eq
import Exun.Pattern
import Exun.UI
import Exun.Simpl
{exp,_} = parse "sin(x*y)/cos(x*y)"
Exun.Fun.revert_compounds exp