Unlimited progress

Zhang Xiaobai studied logistics management and Meng Shuangshuang studied finance, both of them belonged to the School of Economics and Management. Generally, they only had the opportunity to take general courses like English and advanced mathematics together. For some professional courses like logistics and econometrics, they usually had separate classes.

A college class usually lasts an hour and a half, which is equivalent to two classes in high school. It was not until the end of the get out of class that Zhang Xiaobai finally changed his posture.

He changed from supporting his head with his right hand to resting his entire head on his right hand, while his eyes were still staring at Meng Shuangshuang.

"Have you seen enough?" Meng Shuangshuang looked at Zhang Xiaobai, who seemed to be a little abnormal, and said with some embarrassment.

But Zhang Xiaobai just smiled and shook his head, looking like he hadn't seen enough, leaving her helpless.

"Meng Shuangshuang, let's go. We have to go early to grab a seat for Master Yi's class!" The person who spoke was a girl wearing glasses and had a scholarly air. She had previously sat in the row behind Meng Shuangshuang.

"Bai Ya!" Zhang Xiaobai just then saw the girl behind him and felt a little embarrassed for a moment. It was true that beauty is in the eyes of the beholder. During the more than one-hour class, he only looked at Meng Shuangshuang and didn't pay any attention to the acquaintance behind him.

"Zhang Xiaobai, what's wrong with you? Why are you so excited to see Bai Ya? You were staring at Meng Shuangshuang for the entire class~"

The person who spoke was the girl next to Bai Ya. Zhang Xiaobai remembered her name was Liu Linli. She was usually carefree and was in the same dormitory as Meng Shuangshuang. As for Meng Shuangshuang's other roommate, it seemed that she had asked for leave and did not come to class today.

"Hehe, it's okay. I just feel a little friendly when I see my classmates! Let's go. Where is the next class?" Zhang Xiaobai quickly changed the subject.

"No way! You don't even know where advanced mathematics is?"

"You're going like this?"

Several voices of doubt reached Zhang Xiaobai's ears, but Zhang Xiaobai didn't take it seriously. After all, it was just a class, and the focus was still on making up for his regrets.

Since there was only a twenty-minute break between classes, several people quickly moved to another classroom to prepare for the advanced mathematics class.

Master Yi is an old man who is nearly sixty years old. He is said to be a second-level professor and is qualified to be evaluated as an academician. At this time, he is organizing his courseware on the podium.

The class discipline is usually very strict. Basically, we spend a few minutes calling the roll in every class. If we see someone wearing slippers to class, we will definitely criticize him for his bad learning attitude.

"Let's sit in the back!" Meng Shuangshuang looked at Zhang Xiaobai's slippers and shorts and pulled Zhang Xiaobai's sleeve.

Zhang Xiaobai did not agree to Meng Shuangshuang's proposal. He knew that Meng Shuangshuang and others liked to sit in the front rows so that they could hear the lectures more clearly. At most he would be criticized, but he would not lose any meat.

"Ding ding ding ding~" the class bell rang.

[Ding, congratulations to the player for making up for his regret*1, reward: 1 free attribute point]

Damn, this can make up for the regret? Did I once take Meng Shuangshuang to the end?

"Zhang Xiaobai!"

"To!"

This time, Zhao Xiaobai was a little disappointed that he did not get any reward reminder for being called out.

"Basic elementary functions include: inverse function (y=arctanx), logarithmic function (y=lnx), power function (y=x), exponential function (y=ax), trigonometric function (y=sinx), constant function (y=c)..."

"What is differentiable must be continuous, but what is continuous may not be differentiable..."

"The dividing point between the upward concave arc and the downward concave arc on a continuous curve is called the inflection point of the curve..."

...

While Meng Shuangshuang was taking advantage of the time to copy the notes on the blackboard, Zhang Xiaobai picked up a pen and wrote down a function r=a(1-sinθ) on the draft paper.

While the old professor was writing on the blackboard, Zhang Xiaobai handed the draft paper to Meng Shuangshuang.

"what?"

"The teacher just talked about polar coordinates, but I didn't quite understand. Can you draw a graph of this polar coordinate equation for me?" Zhang Xiaobai said seriously.

Meng Shuangshuang looked at him with a serious expression and felt a little strange. Wasn't this guy good at math? Why did he even ask himself such a simple question?

"When θ=0, r=a. Let's mark point a on the coordinate axis first."

"When θ=90, r=0, we mark point b on the coordinate axis."

"When θ=180, r=a, we mark point c on the coordinate axis."

"When θ=270, r=2a, we mark point d on the coordinate axis."

“We connect these dots and that’s it…”

When Meng Shuangshuang said this, she understood the moment. This is a heart-shaped picture. This guy is playing tricks on me again. Why has he changed today?

I looked up at Zhang Xiaobai, and saw that he was still serious. I instantly had the urge to punch him, but his profile was quite handsome.

Zhang Xiaobai accidentally read this function in an extracurricular book. It is a secret mathematical formula between Descartes and Christine.

[Ding, congratulations to the player for making up for his regret*1, reward: 1 free attribute point]

"Hehe," Zhang Xiaobai finally smiled wickedly when he saw that Meng Shuangshuang understood what he meant.

Seeing Zhang Xiaobai's smirk, Meng Shuangshuang couldn't help but pinch him, and Zhang Xiaobai could only hold it back.

"Ahem! Student, can you please answer this question?" Teacher Yi on the podium saw the two students in front of him seeming to be having a lot of fun, and couldn't help but call out their names.

Seeing that all the classmates were looking at him, Zhang Xiaobai stood up, looked at the indefinite integral on the blackboard, and tried hard to recall the relevant knowledge in his mind, but in the end he could only sigh helplessly.

"I'm sorry, teacher, I don't know!" Looking at Zhang Xiaobai's thoughtful expression, Meng Shuangshuang couldn't help laughing. Let's see if you dare not listen in class.

"Students, please sit down! There must be classroom discipline. Even though this is just a math class, you have been learning it since elementary school, but this is a matter of attitude. Learning requires rigorous study..." Teacher Yi began another long ideological education.

Zhang Xiaobai didn't feel annoyed when he heard these words this time. Instead, he felt particularly cordial. Yes! Attitude is very important!

It's 12:20, get out of class is over!

"Where are you going to eat?" Liu Linli looked at Meng Shuangshuang and said.

"Let's go to the cafeteria!" Meng Shuangshuang looked at Zhang Xiaobai.

"Okay! Let's go. I'll treat you today!" Zhang Xiaobai smiled widely.

"???" The three girls, including Meng Shuangshuang, were a little confused. What happened to this classmate today? Although they were somewhat familiar with Zhang Xiaobai before, he had never invited anyone to dinner.

"Degang! Shikang, come on, I'll treat you to a meal." Zhang Xiaobai ignored the looks from others and called out to Wang Degang and Fu Shikang who were about to leave. After all, they were his roommates, and he didn't have the luck to meet them once, so it was only right that he treat them to a meal.

As there are tens of thousands of people in universities, there are usually multiple canteens. Each canteen serves home-cooked meals and students can get their own food and pay with a credit card. A meal usually costs no more than 10 yuan.

Zhang Xiaobai just thought that he seemed to have neglected other people around him except for being with Meng Shuangshuang, so he made this suggestion. Anyway, there were only a few hours left.

[Ding, congratulations to the player for making up for his regret*1, reward: 1 free attribute point]