Problem Landau relativity special

[nulliusinverb]

Hello!:
My name is Camilo, i want answer one question about of special relativity, in Landau volumen II.

the question is in doc attachments!

is my first time, sorry.

 

[jtbell]

I don't see any attachments.

 

[nulliusinverb]

I wanted to delete the entire message but could not, my reason was that I answered my questions, was a simple "binomial series." Anyway I upload issue again.

thank you very much.

 

[lalbatros]

A Taylor series, limited to 2-d order terms.