




L'Hospital's rule as stated applies when f(a) = 0 and g(a) = 0 so that .
Other indetermined forms include .
There is a version of L'Hospital's rule that applies to ; it is the same as the original rule with replaced by .
The same approach can be applied to the limit f(x)  g(x) as both f and g approach infinity, by treating by L'Hospital's rule.