The problem in question is as follows:
Limit as u tends to 0 of:
When differentiating the denominator it becomes 1-sec^2 u which makes the denominator 0. I was under the impression that l'hopitals rule doesn't work under this condition of g1(x) being equal to 0.
That being said, the answer sheet I have continues to the conclusion that it tends to infinity disregarding what I have seen. Am I mistaken