If Bao Guowei is the only one in the class who does not copy his homework, it is really a bit inappropriate, and maybe some cautious people will squeeze out Bao Guowei because of this.

It's less likely, but it's not impossible.

After all, Mr. Shen is forty or fifty years old, and he has taught not a thousand but eight hundred students, and he has never seen anything.

So he stood on the podium, raised his right hand and held out two fingers.

"I gave Bao Guowei two questions, and if you can answer one correctly, you will be exempted from copying half of the amount in the class. If you can do both, the class will be exempted from copying. ”

As soon as these words came out, all the students paid attention.

"In the first question, draw any right triangle and represent the sinusoidal cosine tangent of all the angles in it."

This question is a scoring question, as long as you know the three theorems, you will definitely be able to answer it.

"In the second question, draw a table of special values of trigonometric functions in the form of a list grid, with a total of twelve special values."

This question is also a scoring question, which is purely based on memory.

Mr. Shen came up with two questions.

Bao Guowei got up from his seat and left for the podium without any pressure.

"Bao Guowei, on! Give our Himalayan team a fight! ”

Guo Chun gently pushed Bao Guowei's back.

Chen Jinhua looked at Bao Guowei in a daze, not knowing what he was thinking.

The distance from the back row to the podium was short, but Bao Guowei walked slowly.

Because the students of the Tao were whispering to him.

"Can it be done? Bao Guowei! It's up to you! I really don't want to copy these 300 times, and my hands will be wasted after copying. ”

The man's face was pleading, and his tone was sad.

"You are our hope! If you succeed, I'll ask you for stinky tofu. ”

This person seems to be very confident and impassioned in Bao Guowei.

"The only hope for the class is you!"

Bao Guowei is numb, isn't this a bit too tragic, he just went up to write something.

"Baozi, you're really handsome!"

Hearing this, Bao Guowei almost didn't fall, this is not what a female student said, but a boy!

Female students in this era are very reserved, and it is impossible to have the face to say such things.

Looking back, it was a male student who looked like he was a good bully. He looks relatively small and wears a black and white suit!

Mr. Shen gave the podium to Bao Guowei and went to the side to watch Bao Guowei answer questions on the blackboard.

Bao Guowei picked up the chalk, and all the teachers and students were paying attention, and first answered the second question of the list.

All that remained in the classroom was the sound of breathing, the rustle of chalk rubbing against the blackboard, the thud of tapping, and even the late autumn wind seemed to have stopped, no longer blowing, and even the sound of the leaves shaking outside the window disappeared.

Thirty degrees of sine is one-half, forty-five degrees is the root number of two, sixty degrees is the root number of two, and ninety degrees is one.

Cosine 30 degrees......

Tangent 30 degrees......

Bao Guowei neatly wrote the 12 special values on the left half of the blackboard, then drew charts and annotated them.

Some students turned the first page of the "General Catalogue of Geometry" and checked whether Bao Guowei wrote correctly on the blackboard, and they were terrified, for fear that Bao Guowei would write it wrong.

"All right! Same as in the books! ”

"Buns are awesome!"

It's the voice of the student who just looked like a bully! He seemed to be in a state of overexcitement and whispered, but it was shouted in the classroom after all, so that everyone heard it.

Although he was standing on the podium, Bao Guowei could vaguely hear the sound of laughter, but because Mr. Shen was still there, no one could laugh after all.

The chalk in his hand paused slightly—he was nicknamed on his first day of school!

In other words, this nickname should not accompany me for a school year!

Mr. Shen glanced back at the student, but he didn't say anything, just watched intently as Bao Guowei finished the second question.

The first problem is a basic to the point where it can no longer be a basic scoring question, and the list grid also needs to use your brain to think about the layout, which can be easily deduced by knowing the definition.

Bao Guowei drew three classic right-angled triangles with a side length ratio of one to a root number and three to two.

One is three to two, and it can be inferred from the special trigonometric values that it is actually a right triangle with three angles of 30 degrees, 60 degrees, and 90 degrees.

Bao Guowei marked the three sections of ABC at the three corners and marked the length of the line segments.

Angle A is set at thirty degrees, angle B is set at sixty degrees, and angle C is set at a right angle.

Then the sine of angle A is BC to AB, and the ratio is two to one.

The cosine of angle A is CA to AB, and the ratio is three to two for the root number.

The tangent of angle A is the ratio of BC to AC, the ratio of which is one root number three, which is reduced to three thirds of the root number.

In the same way, angles B and C can be obtained.

……

Bao Guowei stopped writing, which can be regarded as an overanswer to the question, not only indicating the sine, cosine, and tangent of each angle, but also listing its values.

Although the pen can't be shocked by the wind and rain, and can't cry ghosts, this long string of neat chalk words written on half of the blackboard, plus the typography that is quite pleasing to the eye, is still a bit bluffing.

At least it's easy to frighten the students in the class who don't understand anything for the time being.

"Yes, there is no problem with writing."

Mr. Shen nodded.

Hearing this, the hearts of the students in the class were very excited.

"Buns! Pack Saint! I'm a role model! ”

"That's awesome! So much can be written correctly! ”

"I just read the book, and these things don't seem to be difficult, just memorize."

One of the students said to himself, which immediately caused outrage.

"Let your mother ......"

"You can do it! The teacher asked you a question just now, why didn't you talk for a long time? Now it's time to start talking nonsense! ”

"If you don't think it's difficult, you can copy him three hundred times, why didn't you speak when the instructor just asked the question?"

Bao Guowei completed Mr. Shen's task, exempting him from copying three hundred times, and the students were in a good mood, so they naturally would not be accustomed to these people who forgot their mothers after eating.

The man lowered his head, blushed, and said no more.

"That's it! Quiet down! I read all the words written on the blackboard, first memorize the definition, just combine the diagram drawn by Bao Guowei to understand, and then memorize the special value table! Tomorrow I will check the three theorems, and the day after tomorrow I will check the special value table, if there is one, it will be five hundred times! ”

Bao Guowei completed the task and returned to his seat, Guo Chun poked Bao Guowei with his finger.

"Bao Guowei, well done! I will make you the vice-captain of my Himalayan basketball team! Chin this. ”

"Don't even speak! That one is called Guo Chun! Keep your mouth shut! ”

……

It was almost an hour before the bell rang for the end of class.

It's only about four o'clock in the afternoon, but it's dark early in late autumn, and it's already a little dark outside the window, and even insects are starting to chirp.

"Okay, day students can leave school after this class, Gusu City has not been very peaceful recently, the school recommends that day students go home early and don't stay on the street."

After saying this, Mr. Shen left immediately, without delaying for a second.