I have the following expressions and I would like to obtain a final result purely in the real domain.
Refine[Sqrt[-1] / Sqrt[a^3], Assumptions -> a<0] Refine[Sqrt[-1] / a^(3/2), Assumptions -> a<0]
The first expression is simplified to
1 / (-a)^(3/2)
while the second one is kept as
i / a^(3/2)
How can I force the first simplification?