Calculating a limit by change of variable, limits of functions, change of variable

How to use a change of variable to find a limit corresponding to the indeterminacy 0/0 for a quotient of polynomials.

[heheboi]

Hello Sir, It's an excellent way to teach at online class in India.And very thankful that I found this video please upload on many more interesting topic too Sir.

[andrebohler]

Finally I get it! Thank you so much! Greetings from Brazil!

[francocarraminana]

Interestin way to solve it. I did it using derivaties.

[subhamjain]

Well I have a question for you about your PhD thesis what was your thesis on ?

[asbarker]

I prefer the factoring method, where possible.

[ptrexy]

One question that I have had for years: why does changing variable maintains the limit? What it the theorem and proof of that?

[vareshnadkarni]

sir I would like to know, what exactly 0/0 form is.Is it not defined or is it infinity?or something else??