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Consider the first plot line,
p1 = plot(rs(exx = 4, x = 0.0) , (x, 0, .2), color='red' )
And let us see what we are plotting here:
sage: rs(exx = 4, x = 0.0)
(sqrt(-kx^2 + 4) - sqrt(-kx^2 + 1))/(sqrt(-kx^2 + 4) + sqrt(-kx^2 + 1))
Above, kx is a variable, there is no meaning for plotting the above expression for $x$ (which no longer appears, it was silenced to zero, but) running from $0$ to $0.2$.
We have even less chances to plot something for the same $x$-interval for the ser-plot:
sage: ser(exx = 4, x = 0.0)
-(-I*sqrt(kx^2 - 4) + sqrt(-kx^2 + 1))/(I*sqrt(kx^2 - 4) + sqrt(-kx^2 + 1))
Here we can push the $I=\sqrt{-1}$ inside the radicals and compare, getting the same expression from an algebraic point of view.
But why do we plot these expressions?
