This is ok, as long as it is not an excerpt from the original text, there is no problem at all. When extracting, it is best to change individual words in the language, adjust the order of the language, and appropriately change the letters in the formula. . Hehe, I just graduated and did the same thing. In fact, the teacher said very harshly, all to scare the students. It's nothing, it's easy to do. The teacher won't find fault unless you copy the original text. So don't worry at all ~ ~ ~