Hi everyone!

I started revision today and im stuck on a limit question. I have the solution but I still have no clue of how to solve it. maybe another simple example may help.

Question 1.

Evaluate the limit of as

Answer:

If then get

Therefore let then in limit

i.e.

If let and

Therefore

with is same answer as before

Thats the answer above. I think they use two solutions but both ways are right. But I don't get why you have to put in . Hopefully someone can help.

Thank you

Dadon