At the beginning of the game, the school flower is fooled, and 99 yuan is used to create a golden fi

Chapter 25 Don't hide it from everyone!Nine years of education, I only spent three years
【质量为2kg的某物体，在平面直角坐标系中运动。已知x轴上的坐标为x=3+5cos2t，y轴上的坐标为y=-4+5sin2t，t为时间物理量。

Question: What is the speed of the object?What is the net force acting on the object?What kind of motion should the object do?Can you find out the characteristic physical quantity of the object's motion?
Four questions in a row!
The students present looked confused.

"This question... is so difficult!"

"There is both advanced mathematics and physics, and there is no way to start!"

"Academician Qian is too perverted!"

"Is this still a warm-up question?"

"What kind of difficulty is that difficult?"

Qian Yuheng looked around.

I saw that all the students lowered their heads.

Ugh!
He couldn't help but let out a long sigh.

really!

This question is still out of bounds.

He had no choice but to invite his most proud student!
"Shicheng!"

"Come on, explain this question to the students."

Yan Shicheng stepped forward confidently, a gleam flashed in his eyes.

The opportunity is coming!

Here's your chance to wash your ass off!

After a few glances, I soon had a clue.

He just picked up the chalk and wrote down a "solution"!
Xu Jin spoke up:

"For the first question, the speed of the object is 10!"

"Second question, the total external force on the object is 40N!"

"The third problem is that the object moves in a uniform circular motion!"

"The fourth question, center (3, 4), radius 5!"

Answer all four questions in one go.

No red face, no breath!
Everyone was stunned when they heard it.

"What the hell?"

"Is there an answer so soon?"

"It can't be nonsense!"

On the other hand, Qian Yuheng's body shook violently.

As the question maker, he knew the final answer better than anyone present!

Yan Shicheng naturally didn't believe it.

Quickly list the steps to solve the problem and find the answer to the question...

He actually said exactly the same thing as Xu Jin, exactly!

"This……"

"how is this possible?"

"How could a high school student solve this problem?"

Strictly speaking, this question is beyond the outline!
Ordinary high school students can't solve it at all, unless...

He is a genius!
See you all over here!

Xu Jin smiled slightly.

then……

Start your own personal pretense show!

"To tell you the truth, I have been very talented in mathematics since I was a child!"

"When I was seven months old, I could recite Arabic numerals!"

"When I was one year old, addition, subtraction, multiplication, and division within ten were already difficult for me!"

"When I was three years old, I went to kindergarten, and I was able to recite the multiplication table backwards proficiently!"

"Four years old, in the first grade of elementary school, other students are still troubled by the addition and subtraction of single digits, but I have already memorized pi to the hundredth place!"

"Graduated from elementary school at the age of five!"

"Graduated from junior high school at the age of seven!"

"I, Xu Jin, completed the nine-year compulsory education you all went through in only three years!"

After saying that, he snapped out three fingers.

The students were stunned.

"Wow, you are amazing!"

"He actually finished compulsory education four years earlier than Senior Yan!"

"Xu Jin, why don't you blow up more?"

"Crazy, there's something wrong!"

Ma Shanshan looked contemptuous.

"exactly!"

"You are so good, how can you still be at the bottom of the exam?"

"Just ask the senior three students here, who doesn't know that you, Xu Jin, are a college scum?"

"Bragging B, don't make drafts!"

Many male classmates who were jealous of his handsomeness kicked Erlang's legs and echoed him.

"It's ridiculous, how lonely is Invincible?"

"How can mere scumbags understand?"

"never mind!"

"I'm afraid you won't understand it in your life!"

"Xu Jin, you..."

Ma Shanshan and those male students who spoke rudely were gnashing their teeth angrily: "If you are really that good, you should come up with a question to test everyone!"

At this time, Qian Yuheng on the stage also became interested.

"Student Xu Jin, why don't you improvise a question!"

"I just want to see how well you have mastered your three-year compulsory education?"

With such heavyweights speaking, Xu Jin naturally couldn't refuse.

I saw him stepping onto the podium smartly.

When passing by Ma Shanshan, he said with great disdain: "Later, open your dog eyes wide and take a good look at what is genius?"

Come to the podium.

Xu Jin calmly took the chalk from Qian Yuheng.

In the eyes of thousands of people, he wrote seventeen characters!
[f"(x)=root sign (1-x square), find f(x)?】

At the moment when he finished writing, Qian Yuheng frowned tightly and fell into deep thought.

"teacher?"

Seeing that the call was fruitless, Yan Shicheng also looked at the blackboard curiously.

Suddenly, I was stunned.

This... This topic was really written by a high school student?

He stared at the blackboard for a full 10 minutes.

The teachers and students in the audience did not dare to take a breath.

I wanted to do the calculations, but found that there was no way to start!

This question is beyond their comprehension!
Until the school bell rings.

Qian Yuheng just let out a long sigh: "Student Xu, your question is too difficult..."

"Can I ask you, its solution?"

hiss!
There was a large sound of gasping in the audience.

Everyone stared at Xu Jin in disbelief as if they were looking at a monster.

A person who even academicians have to ask questions?

How could it be a scumbag?

Was it all an illusion before?
You have been a genius for a long time, want to change your life style?
Boss!

This is a fake boss!

For a while, the whole venue exploded.

Yan Shicheng is still unwilling to accept the reality.

The glasses on the bridge of his nose were about to fall off, and he didn't bother to help them.

Holding Qian Yuheng's hand, he said, "Teacher, this kid must have written this question blindly. Don't be fooled by him."

"Shut up, Shicheng! You don't understand..."

The last three words pierced Yan Shicheng's heart like a bolt from the blue.

Ha ha!

Say I don't understand?

I am a genius!
A genius in contemporary mathematics!

I want to see what tricks this kid can play?
For a genius, the three words "you don't understand" are the greatest insult!

It's like saying "you can't" to a man!
The corner of Xu Jin's mouth twitched.

"Since no one will, then I will write out the solution to this problem!"

Swish swish!
His hands seemed to grow on a blackboard, and wherever he passed was one formula after another.

Qian Yuheng saw cold sweat on his forehead.

simply!
This problem-solving speed is too fast!

The eyes can't keep up at all!
Not to mention the brain...

"Student Xu, can you write slowly?"

"Yes! Slow down..."

Soon.

The entire blackboard is filled with writing.

“设x=sint，-π/2∫√(1-x2)dx=∫cos2tdt=∫[(1+cos2t)/2]dt
=1/2(∫dt+∫cos2tdt)=1/2∫dt+1/4∫cos2td(2t)
=t/2+(sin2t)/4+C=t/2+sintcost/2+C
由于x=sint，-π/2Cost=√(1-sin2t)=√(1-x2)
故所求积分为∫√(1-x2)dx=arcsinx/2+x√(1-x2)/2+C……”

Qian Yuheng became more and more excited the more he watched.

He took Xu Jin's hand on the spot, and said with tears in his eyes, "Student Xu Jin, what is your problem-solving technique called?"

"calculus!"

"Calculus? Calculus..."

After pondering for a moment, Qian Yuheng shed tears of excitement like a radiant face.

"I have worked hard on the difficult problems for many years, but I didn't expect to make a major breakthrough here today."

"And the one who made such a proud achievement is actually a high school student..."

While sighing, he took photos of all the solutions on the blackboard with his mobile phone at the speed of light.

Immediately after...

He took Xu Jin's little hand again.

"Student Xu, thank you!"

"Thank you for your great contribution to Huaxia Science!"

"I don't know if you would like to join our Department of Mathematics, Huaqing University?"

"I still have a recommended spot in my hand..."

(End of this chapter)