I am sorry for any bad words that I used I was just a little annoyed of the way people talked to to a person that they don't even know. Like I was some sort of a student who wants things solved by others, which I am not. I should have expect such type of reaction from the internet since people are prone to jump into conclusions. Anyway, of course we have learned a u substitution but as I addressed in every single of my replies this is not some sort of u substitution that you can come up with on your own. That is something that the person below you on the replies noticed. Its been given on formulas, books, notes ect. If you watch one of my pictures you will understand what type of formula I am talking to. This was the only reason why I posted this on the internet, if people were aware of any formula that fits to that problem that I am not since our professor didn't give any. If you believe or have thought of some simple substitution that can solve this problem I am extremely curious to see which one since I found none, so share it if you want. It doesn't matter anymore the quiz closed but I am just curious.