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One could do In[74]:= Clear[f] f[\[CapitalOmega]_, K_] := 1 + (0.00021600988594924262 K^10 + (3.81005811091083 10^(-6) - 5.617765774643865 10^(-9) I) K^2 \[CapitalOmega]^8 - \ (1.938898556339015 10^(-8) - ...