If I am reading it correctly, you are asked to evaluate
using L'Hospital's Rule...
First check that it is indeterminate.
You should see that it tends to
So you can use L'Hospital.
Now, take the derivative of the top, and the derivative of the bottom.
You will have
Now see what happens when you let it .
You should get
It is still indeterminate, so use L'Hospital again.
(note that since the derivative of then the derivative of .)
Use L'Hospital again...