I actually used a 2D Implicit plot.
I typed the following function:
1=int(sqrt(x)/(exp((x-mu)/T)+1), x = 0 .. infinity)
Then I right clicked on it, and the smartplot gave me the option of a 2D implicit plot [mu,T]. I wasn't sure if this was what I wanted, but after about 15 minutes, I received a plot of [mu,T]. As a check, I went back and used points from the plot to see if they gave me an solution of 1 for the integral. I found several confirmation points. I am not sure exactly how the 2D implicit plot works, but it seemed to do the trick.
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