real analysis, math homework help

real analysis, math homework help

Hello, please I need you answer this question with details so I can understand it :

# 1 page 305 : use this way ( in page 22 in the file) of the proof to prove this question .

the book methods of real analysis, goldberg and the link the book below:

https://alansinyal.files.wordpress.com/2012/08/met…