New solution: is THAT correct?
Thanks everyone for the reply. :)
When I told the teacher who solved this question about this, he admitted the flaw, and solved it in another way, which seems absolutely correct to me. Again, the PDF file has been attached herewith.
Please see the new solution and give your opinion about it.
Some explanation please...
Please prove that to me (or provide me with the link to the proof). I'm really confused about this one, whether I should take the absolute value, or both the positive and negative signs.
when what has been shown is that:
|U-V| = |B-A|
Can you too give me some explanation?