Plotting a harmonic function

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Sergio Manzetti
Sergio Manzetti 2018-2-12
编辑： Sergio Manzetti 2018-2-12
Hi, I am trying to plot the given function:
syms x
Z = x.^2 - exp(x)/3 + (2*exp(-x/2)*sin((sqrt(3)*x)/2))/sqrt(3) + 4/3*exp(-x/2)*cos((sqrt(3)*x)/2)
fplot(imag(Z), [ -4, 4 ])
figure(1)
however, it appears as a straight line, while in WolframAlpha it's quite something different.
Can someone see if this looks ok?

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