I dont know why ?
Whenever I find difficulties concerning my studies, I post them here in italki, But I only recieve coments investigating me, if it is an exam question or something else. Just to make it clear, I have never rely on anyones answer on my examination. And its obvious that we dont know the exam questions till the day we will take them. I have professors that won't hesitate to give Zero as a mark, in case they found same answer in internet. For exampl, I have read an articl lately, and I found some questions under it, that were too hard for me to understand. So I posted them here in iTalki hoping to understand well and enlarge my knowledges, but I only get replies out of the point.
Could someone please show me how to proves.