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Jan 14, 2021 at 21:42 history edited kek CC BY-SA 4.0
added 79 characters in body
Jan 14, 2021 at 21:38 answer added kek timeline score: 3
Jan 14, 2021 at 21:26 comment added kek Should I delete a post, or just let it be, or write derivation myself as edit or answer? (I am new here)
Jan 14, 2021 at 21:24 comment added Philip Ah good. I was just writing that it's nearly too trivial to explain :) Good to know you got it! :)
Jan 14, 2021 at 21:24 comment added kek somehow I got it just now.
Jan 14, 2021 at 21:21 comment added kek could you please show this explicitely, I will accept it as an answer then.
Jan 14, 2021 at 20:43 comment added Philip I'm not sure I understand, which equation gives you $-\sqrt{\beta^2+1}$? The last step that you've written seems fine, $$\frac{1-\beta^2}{\sqrt{1 - 4\beta^2/(1+\beta^2)^2}} -1 =\beta^2,$$ as you require... Also, my answer to this related question might be useful: Conceptual question about special relativity in electrodynamics.
Jan 14, 2021 at 20:32 history asked kek CC BY-SA 4.0