I have a rather large multivatiate polynomial "Dtest" I need to divie it by a cubic poly "DGm" using rem and quo. Both are determinants multiplied out, both given below. Have spent the past 2 nights trying to sort, collect, expand, equate coefficients plex groebner etc. Am trying to collect up all the powers of c3 but cant anything to work. even expand doesn't fully expand "Dtest". If I set c1 and c2 to 1 things are ok but that was just a test. Would appreciate any help.