There are many laws and theorems in mathematics. For example, the geometry problem is more complicated, and it is necessary to write and prove a congruence step. We need to prove another one below, but the two methods are the same, which is equivalent to repeating the method steps, wasting time and occupying the candidate's answer interval. "Same principle" means what results are obtained according to the law of the previous truth theorem. Generally speaking, "the same principle can be obtained …" and "the same principle" is not a theorem, but to simplify the steps and make the complex simple.