20: You should get
Algebraically, the fraction is not really better than what you had before, and now you even cannot find the type of this fraction since you do not know what is in the numerator! What is happening there?
The indeterminate product can have many outcomes, but just one thing is important: Whether it gives 1. Why? If the product does not converge to 1, then in the numerator there is something else than 0, so it is not an indeterminate ratio and hopefully it can be figured out using the limit algebra. On the other hand, if the product tends to 1, then the fraction is of the type "zero over zero" and further work must be done, most likely the l'Hospital rule (which would not be really nice, given the expressions in the fraction).
Fine, what to do with the product? Apply the standard procedure: Change it into a fraction, here the root is the obvious candidate for "putting under" (it is a simple power after all).