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PowerExpand in mathematica


Hi,

Is this a known bug, feature? Or I am doing something wrong?
-------------------------------
Mathematica 4.0 for Linux
Copyright 1988-1999 Wolfram Research, Inc.
 -- Motif graphics initialized -- 

In[1]:= PowerExpand[(-1/t)^(3/2) Sqrt[-t]]

        1
Out[1]= -
        t
---------------------------------
The correct answer is -1/t, of course.

Thanks,
Peter


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