Individual highlights will make you suddenly realize, but all his books are copied from the beginning, so you will feel that the knowledge points are incoherent and Niu Yi is dumbfounded when he listens. His lecture is full of nonsense, and it is a waste of time to talk about a topic in a class. It is best to talk about the previous functions first, which can be used as reference books.

"Advanced Mathematics" has a variety of ideas for induction and problem solving, such as using Taylor formula to solve "A+B" type limit calculation. Zhang Yu not only teaches exam questions, but also introduces mathematical thoughts into three realms: perception, reproduction and accommodation.