(For the convenience of writing, the sine theorem is positive definite and the cosine theorem is co-definite)
[Anthropomorphic]
A topic-writing competition completely created a rift between the two. Every day we were either quarreling or on the way to a quarrel. The key was that Yu Ding could always lose to Zheng Ding. So Yu Ding, who had been wronged, would always go to Huo Huo, his dear roommate, Vector.
Vector: Mi? Am I also a part of your play?
(I don't know how to write an introduction, so just take a look)
A large-scale bloody romance drama "High School Mathematics: The Love and Hate between Zheng Ding and Yu Ding"! Now on the air!
Intention: Study hard