Big oh help Big oh help!!!!!! 1/(1-z^2)= -1/z^2 + O(1/z^4) as z tends to infinity
I don't think you understand the meaning of "Big O". Here is an article on it for beginners. Read it carefully and see if you can understand it. If not, consult your teacher:
https://rob-bell.net/2009/06/a-beginners-guide-to-big-o-notation/
It is a descriptive and NOT a computational notation!.
