Question: plot as implicit plot in 2d and the expression include complex argument

Dear all

Trying to plot this expresion

f := epsilon-1.5+9.3*I = (a+I*b)*(26.+I*(-45.-1.0*Re(a+I*b)^2-1.0*Im(a+I*b)^2))

implicitplot (a^2+b^2) against epsilon

many thanks

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