The difficulty varies from person to person. Generally speaking, students find it more difficult, and it should be a compulsory function, which is more abstract. Conic curve has a large amount of calculation and contains a lot of information. If it is science, you can also choose a combination of 2-3. These parts are generally difficult, and the application of derivatives has appeared in the form of finale questions in college entrance examinations over the years. It is not difficult to understand knowledge, but the questions are more difficult. These all pay attention to returning to nature when studying.