Question: how to move exp and numbers out of root?

Maple returns this: and I want to move the exp out of root so it becomes exp(

Ex3 := Pi*sqrt((4/mu+4/r)*exp(-r/mu))

and I want to move the exp out of root so it becomes exp(-r/2*mu), and I want to take the 4s out so it become 2*Pi instead of just Pi.  How do I do it? thank you for all the help

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