Question: simplification of expression

Hello,

How can i simplify the following expression which should be a function of omega

Thank you for your help
RootOf(18648951784979065025306550403387237945719266604175476158959356802500000000*omega_ar_a^4*_Z^12+12915042208625254837945185843098767874638471738629895734745056630090540000000*omega_ar_a^4*_Z^11+(-222095139405296484681606908541392507418219533972588717754000000000000000000000*omega_ar_a^2+2063671175580295676252981093051948074007901706195024225186306518614140032060000*omega_ar_a^4)*_Z^10+(-153806449418405937872955262366959816703050589908435007966636512000000000000000000*omega_ar_a^2-59674073007868845129583827337757883184923714539106733331793159306427417219813200*omega_ar_a^4)*_Z^9+(-24575214505133778628228474989626030803842014488417971238566247813440000000000000000*omega_ar_a^2+400675488681254317713813190721175885449413987565865806067195430040243093660960361*omega_ar_a^4+699646971368147941428266786001831324690966884739600000000000000000000000000000000)*_Z^8+(710980194526425019405171144148342212005050586365218418076170635267742400000000000000*omega_ar_a^2-84608259508079939387166914979855722315768108944348473355122334081392889214310240*omega_ar_a^4+457925365774370079027529439983293130370632635435499536000000000000000000000000000000)*_Z^7+(-4768425303426165947269325816996410590207177194601279624148756766570114028000000000000*omega_ar_a^2+73163507920906059387758810086674225020089956737280431231760000000000000000000000000000+670004897284237305448089861849948185908904841041823702668559143846233531468654860*omega_ar_a^4)*_Z^6+(-2117724042482293581383896485906180589597006823175075190891694400000000000000000000000000+756431210130989781520761656592560432378921384342555621036512568978219520000000000000*omega_ar_a^2-39335382868015967704148613728086677386378667495492139268344938603823458557342400*omega_ar_a^4)*_Z^5+(-5990156809581660599867894805847665723818695586165807001997771049784212040000000000000*omega_ar_a^2+408091949047482224642701257945147512619588040244496510472558461882309900970848900*omega_ar_a^4+14187131768824527564299457321037498919628847535408345106613591236000000000000000000000000)*_Z^4+(234601629083512899775026920315380135752615750410988329711034039810873600000000000000*omega_ar_a^2-6221915457754730338002323777556334071464752632649188031763728962705503096976000*omega_ar_a^4-1500964991139070211930630333074856156319353215847088093826074240000000000000000000000000)*_Z^3+(106629520267708514109254347400863018482938803566985550074846430008979301589440000*omega_ar_a^4+11884790133594541675524626603952669633174683528340197883723225600000000000000000000000000-2434531460497247318632460161050178702669338048507333601544729415811584000000000000000*omega_ar_a^2)*_Z^2+(-184026209082727213853234951360208480803535180184970633309184000000000000000000000000000+18561294277785170330175347672836004293117049641857903751898803138560000000000000000*omega_ar_a^2-138606601867030140727317747270742023739679326025380008095434371433690137600000*omega_ar_a^4)*_Z+10110061636150567677588246748541645592520839290692104364212504865691732224000000*omega_ar_a^4+2253592344867538185873755328837274961347225087948722581596160000000000000000000000000000-318223377212001286684314705447621593846699149791345911189931543654400000000000000000*omega_ar_a^2) 

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