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Question: Why my second curve is not plotted?

Question:Why my second curve is not plotted?

mary120 65 Maple 2018
implicitplot plotting
September 06 2022
0

Hi

I want to solve two equations (Eqmin and Eqmax) numerically  and plot curves of Mmin and Mmax versus "sigma" in one frame, But the  second curve (Mmax) is not plotted !  What should I do? 
(We know that only real and positive roots are acceptable)
Eq.mw
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