I want to calculate ((a/b)^n)%e.

I know, how to calculate (a/b)%e; the formula is: (a%e * (b^-1%e))%e.

So, the answer to the above question should be,

(a^n%e * ((b^n)^-1)%e)%e

Am I right ?

Plus, I know how to calculate b^-1 , but I want to know, how to calculate (b^n)^-1

Thanks .