The math teacher knocked on the blackboard and started talking about the topic.
After finishing the lecture, he continued: "This time, it is relatively easy to solve the triangle using the sine theorem. If I use the cosine theorem, I don't think anyone can calculate it in the examination room. The amount of calculation is really too large, and it is very convoluted. Every side cannot be misread, it is a square, which is very troublesome."
He looked at He Jingfeng and joked: "Classmate He, I found that you always use the cosine theorem every time you write a question. You only need to write one page of homework, but you insist on handing me three pages. I am tortured by your squares every time. You can't use the cosine theorem this time, right?"
He Zingfeng chuckled lightly.
He Zingfeng's deskmate was a math class representative. He quickly leaned over to read his test paper and opened his mouth: "Teacher, my deskmate uses the cosine theorem."
The teacher was still laughing: "It seems that Mr. He has a special liking for the cosine theorem."
He Zingfeng said "hmm" and said, "Yes, I like Yu Xian very much."
Yu Xian, who was far away in Xichuan City, sneezed.
Intention: love?