why is my plot shows nothing?

`syms w w=-1*10*pi:0.005:10*pi; plot(w,sqrt(w.^2+w.^6)/(1+w.^4),'b');`

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plot

why is my plot shows nothing?

`syms w w=-1*10*pi:0.005:10*pi; plot(w,sqrt(w.^2+w.^6)/(1+w.^4),'b');`

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