I have this problem:
Works for every whole n that is an even number.
I checked if it works when n=2 and it does.
I said that when n=k it works.
While proving that it works when n=k+2 I got it down all the way to this but can't figure out how to proceed:
I also included an image so that it will be easier to read.
Please help and if you can include explanations of every step that would be great.