Four gusts of wind

At the beginning of the lesson, he naturally moved his eyes to the window and stayed at the top of the red mountain for a long time.

He couldn't understand that looking at similar scenes at different times can bring very different feelings, just like the morning light and the evening light are obviously the same light emitted by the same lamp, but in the morning it looks comfortable, as if he has ushered in a new life, and at night, it makes people feel dull and boring.

"Long Shaoxing, I don't know much about this question, can you tell me about it?"

He turned to look at the book handed over by Long Yufen, thought for a while, and spoke.

"This, you first find the conditions it gives, and then use the formula to calculate, pay attention to the pressure of the water when calculating." "

"I had to pay attention to the pressure of the water, so it's no wonder I didn't do it right." "

Long Yufen tapped his head with a pen, squinted at the title in the book, and suddenly replied with a sense of enlightenment.

Seeing that she understood, he turned around and continued to look at the math problem.

"Sin, cos, tan, how should I draw them?".

After thinking about it for a long time, he still couldn't think of it, and he scratched his head in annoyance.

"I'll see. "

"Well, No, that's the question. "

He turned around again and handed the math textbook to Long Yufen's desk, and then Long Yufen just glanced at it and said in a soft tone.

"This question is a complete formula, you just memorize the formula and put it in." "

: "Formula?".

"Hmm. "

Seeing that he still didn't understand, Long Yufen unhurriedly took out his math textbook and flipped a few pages, pointing to a bunch of letters in the book and explained.

"That's all, the square of sin plus the square of cos is equal to 1, sin is equal to tan than cos, you have to memorize these formulas, this is a must, remember these formulas to make trigonometric functions is very simple." You try. "

Following Long Yufen's wishes, he picked up the pen and calculated according to the formula in the book, and it really came out. After that, hesitating to find a new continent, he couldn't hold back his excitement and stared directly at Long Yufen.

"Really. "

"Simple, right?".

"Hmm. "

Knowing the method, he turned around and buried himself in the sea of questions, and when he finished a bunch of questions, there were less than ten people left in the classroom.

"You calculate slowly, Yang Qin and I will go back first." "

"Hmm. "

He waved his hand at the two of them, and after they left, he immediately got up and walked towards Xiaowen and Biyang, and saw that the two of them were entangled in a math problem, so he immediately stepped forward and pretended to say.

"You change tan to sin to compare cos, and then convert sin to subtract cos from the square of the root number, so that there is no only unknown cos." "

As soon as the words fell, Biyang and Xiaowen both looked at him with wide eyes, their faces full of disbelief.

"I can't see that you still have a bit of brains. "

"What do you mean by a bit of a brain, I'm a genius, okay." "

"What should I do with this question?"

"I'll see. "

Hearing this, he squinted at the question that Xiao Wen pointed to, and then, his brows furrowed uncontrollably.

This problem is completely different from the ones he did before, although it is also a trigonometric function, but the previous problem can be converted by a formula, and he has no idea at all about this problem. Looking at the title, it was as if he had climbed many small dirt slopes, and when he was still immersed in a full sense of accomplishment, an insurmountable mountain suddenly appeared in front of him, and he felt an indescribable pressure.

"How?".

"I'll do the math. "

He picked up the pen and tried to find a way to climb the mountain by conversion, but he couldn't even write several methods on scratch paper, and no matter how he converted, he would end up at a dead end.

Seeing that it was really impossible to solve it, Biyang and Xiaowen also joined the battle.

I don't know how long it took, there were only four people left in the classroom, they were together, and there was a teacher's child, and the four of them were buried in the problem together, and they tried countless methods but couldn't solve it, and finally they had to give up helplessly.

"Forget it, I'll solve it tomorrow, it's not too early, go back to sleep." "

"Hmm. "

With that, they were about to get up and leave, when suddenly the teacher's child looked at them worriedly and asked.

"You're going back?".

"Hmm. "

"Give me the key, I'll open the door for you tomorrow, and I'll see more." "

The teacher's child does not live in a dormitory, but in a vacant office in the teaching building, so he doesn't have to worry about going back at night to affect the dormitory manager's rest.

He looked at him and thought for a while, anyway, this person also lives in the teaching building, and it is much more convenient for him to open the door in the morning, and he doesn't have to get up early tomorrow after handing over the key, so he handed over the key to him, and then walked happily towards the dormitory with Xiaowen and the others.

"Could it be that we are doing the right thing, just unravel the last step and get the answer." "

"But how to solve the last step? There is a root number and a square, and if you want to remove the root number, you have to add a power to both sides, which is too big a data." "

"When the data is big, it will be simplified. "

"No, there are five powers after the power, there are cubic and quadratic powers, and you can't cross them out at all." "

"Yes, forget it, let's get up tomorrow and try something else." "

After the long staircase, the moon just hung in the sky, and the bright moonlight made the whole staircase look particularly eerie. If it was a person, he wouldn't dare to go this way anyway, let alone this side, in the moonlight, he was a little frightened when he walked on the other side.

Finally came to the door, the deadbolt was still locked, they could only call the dormitory manager embarrassed again, and then, the dormitory manager put on his coat and took the key out to open the door with a disgusted face, and the three of them went to the dormitory in disgrace.

"Keep your dorm quieter. "

"Okay, I'm sorry. "

The three of them lowered their heads to apologize, and slowly opened the door of the dormitory, Lao Ma chatted energetically with Ah Hui and Lao Ruzheng, and as soon as they came in, they couldn't wait to let them comment on who was right.

He didn't know what they were arguing about, so he could only say that all three of them were right.

"Right, thrash, if you understand something, all three of you are right." It's clear that only I am right. "

"As far as the gossip from your old horse doesn't know where it came from, I am the only one who can shovel a shovel." "

"If you want me to say, you are both wrong, and I am the only one who is right. "

He was puzzled, and then slowly walked over to Ah Jin and asked.

"What are they arguing about?".

Ah Jin gave them a disdainful look and replied.

"These three who are full of food and support, and no matter which Ultraman is the most powerful, they have been fighting for more than an hour." "

"I'm really full." "

He responded, and then immediately the basin and the handkerchief walked to the bathroom with Xiaowen and Biyang.

In the process of receiving water, Xiaowen was still entangled in that question, always coming up with new ideas, and then Biyang broke his illusions, and those new ideas had reached a point where he couldn't understand them.

Also, from scratch, he only knows the conversion formula now, and if it goes deeper, it will be like listening to a book from heaven to him.

"Long Shaoxing, do you think this method works?"

"Huh, I'll try it tomorrow." "

He didn't know what to say, after receiving the water, he hurried back to the dormitory, washing his feet, the old horse, they were still arguing, no one could convince anyone, he immediately jokingly let them fight, whoever wins is justified.

"Okay, Ah Hui, come on, see if I don't hammer you to death." "

"Just your small body, can withstand my hammer, I will lose money if I hammer you out, Lao Ru, you go." "

"How can I use him to beat him, I can pinch him to death with my hands all the time." "

Lao Ru said that he didn't forget to make a move, and when he saw this, the old horse suddenly became energetic and hurriedly climbed out of bed.