Hi, I have the following problem. I think I know how to solve the second part (I have done 2 other problems that look very similar), however, I have no clue about the first part :-/. Thanks for your help!

Part 1 (the one I have no clue about): Prove that the equation has no solution with in .

Part 2 (which I think I know): Then use this to prove that the equation has no solution with and in