I'm stumped, this is my first experience with a proof like this. I tried many different things, but I was only able to prove it for certain K, L.
Additionally, I tried proving that for all (a,b) there exists some K,L that satisfies the equation, but I had no luck with that too.
Additionally, I tried proving that for all (a,b) there exists some K,L that satisfies the equation, but I had no luck with that too.