l'Hospital's rule and limits.

, which gives the indeterminate form . Using l'Hospital' rule gives:

But, the book gives a different answer and I confirmed their answer by using a different method. What I want to know exactly is why l'Hospital's rule failed to work for this limit.

Re: l'Hospital's rule and limits.

Quote:

Originally Posted by

**Pupil** , which gives the indeterminate form

. Using l'Hospital' rule gives:

But, the book gives a different answer and I confirmed their answer by using a different method. What I want to know exactly is why l'Hospital's rule failed to work for this limit.

The derivative of is .