Comment:
- Even some students calculated the wrong derivatives, they still got the correct pictures. I would suspect they used some `outlawed’ methods to get those graphs or they are super smart that drawing graphs of functions becomes their second nature. However, you are supposed to write the intermediate steps in the solution. Using wolframalpha or google to sketch graphs is a good way to check your answers, but do not rely on it because during the test you are going to fight on your own.