23: If you tried to use the l'Hospital rule, you should get
Factoring the leading terms leads to
The first term tended to zero as a
geometric sequence
with |3/4| < 1. Now why do the two fractions in the big fraction tend to
zero? We know it from the
powers scale. If
somebody asked for a proof, it would be simple, just a standard application
of the l'Hospital rule (twice).
Answer