1) Getting caught is cheating. Getting away with it is advancing. It's the human condition. If you cheat now, you'll win throughout life by knowing how to think outside the box, take chances, and generally come out ahead more often because of it.
2) Ask yourself if you really need to learn these things for any JOB (emphasis on job, because only an employer that requires an employee to know certain things cares) whether or not you really need to know this information.
3) If you understand the theory of the formula your supposed to be tested on, that's more important than getting the answers right anyway. Giving the answer the test requires you to understand is all that matters. Hence, tests are graded on a pass/fail method of merely getting enough questions right (50%?) to prove you understand the formula enough where as a complete failure (minus lucky answers) by having less than the sufficient percentage.
4) If your given all the tools available to unlock a perfect score, you'd be proving yourself a fool by failing to utilize a guaranteed perfect score and thus fail your teachers expectations by choosing a route of failure. If you manage to success on your own merits, he won't know that you didn't cheat and merely assume that you did. Either way, you take the easy route and get the same rewards as the risky route of much greater difficulty. It doesn't make sense logically to refuse 'cheating'.
5) The phrase "Cheating only cheats yourself" is nonsense. Cheating is merely understand to take advantage. The people who have advantages in life get ahead far better than those who are suppressed by the rules. Maximize reward, minimize effort. Only in instances where max effort yields maximum reward should you ever try hardest.