Question: How to plot the following function containing an imaginary part

How to draw the following function containing an imaginary number
 

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u := proc (x, t) options operator, arrow; 1/2+I*sqrt(2)/(exp(x-t)+2*exp(-x+t))+(1/2)*(exp(x-t)-2*exp(-x+t))/(exp(x-t)+2*exp(-x+t)) end proc

proc (x, t) options operator, arrow; 1/2+I*sqrt(2)/(exp(x-t)+2*exp(-x+t))+(1/2)*(exp(x-t)-2*exp(-x+t))/(exp(x-t)+2*exp(-x+t)) end proc

 

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