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Cannot plot this functions


Hello,
    I have a function of a phase response like:

-ArcTan[1 - sqrt(2)* Im[Ï?] - Re[Ï?^2], -Im[Ï?^2] + sqrt(2)* Re[Ï?]]

I need to plot the negative derivative of this function with respect
to Ï?. Whne I use plot it gives me the error:

function is not a machine - size real number at Ï?  =1.8622242690864824`*^-7

How can I avoid this problem??

Milind


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