Hello, I'm glad to answer your question. You should refer to a form of finding the limit by Robida's law. For example, there are 0/0 types, there are/types, and then there are 0 0 types ~ ~ ~ You can refer to the textbook of advanced mathematics in Tongji University. I hope the above content can help you. If you think this answer is satisfactory, please choose it as the satisfactory answer. thank you