(College Entrance Examination) It is allowed to use theorems and laws that have not been learned in high school, such as the parametric equation of the definite integral conic curve of the characteristic equation. It is best not to use it. But if it is an elective course, you can use it. Some famous ones sometimes work and sometimes they don't. It's hard to say. It depends on the teacher who corrects the papers. But if you know the derivation process of these formulas, you can prove them on the test paper and you can use them directly. You can't clearly know that you are lazy, but he still has to give points.