Désagréger is a french first group verb. So it follow the regular conjugation pattern of the first group like:
aimer.
Follow this link to see all the endings of the conjugation of the first group verbs :
conjugation rules and endings for the first group verbs.
However, although the terminations are perfectly regular, stem can be irregular and have numerous variations.
Désagréger is conjugated the same way that verbs that end in :
-éger.
For sound purpose, verbs ending in
-é-consonne(s)-er transform the
« é » in
« è » before silent endings. For sound purpose again, verbs ending in
-éger add the letter
« e » after the stem letter
« g » with endings in
« -a » or
« -o ».