Chapter 20 Just a Trigonometric Function

"Classmate Yang Dongqing, do you know what your biggest responsibility is as a student?" Su Mu calmly interrupted.

"What tricks are you trying to play again!?"

"The biggest responsibility of a student is to study! And you, Yang Dongqing, as the last student in the class, have seriously hindered the class. As the monitor, I have the obligation to provide you with after-school tutoring." Su Mu pushed. Putting on his glasses and holding a thick book in his hand, he could only write the words "excellent in both character and study" on his face.

"Su Mu! You are such a lunatic! What a fool!"

Su Mu hated him and shook his head: "Your study attitude is very improper. It seems that I must encourage you."

As he said that, he took out a math problem book and placed it in front of Yang Dongqing.

"Come on, let's solve this trigonometric function. The formulas you need to use are all in the book."

"I'll forgive you..." Yang Dongqing was about to curse, but Su Mu's next words made his expression suddenly change.

"If you can't do it within fifteen minutes, I'll cut off one of Miss Jasmine's fingers." Su Mu said with a smile.

Yang Dongqing suddenly raised his head, his face full of anger: "How dare you! If you dare to touch Jasmine..."

"Shh! Don't be impatient. I've always been true to my word. If I cut off one of her fingers, I will never cut off two. Now the opportunity to save her is before you. If you really love her and don't want her to get hurt, then Let’s solve this trigonometric function.

It's just a trigonometric function. You have learned it in class, and the textbook is in front of you. If you still can't do it, don't blame me.

Now, start timing. "

Su Mu smiled and took out the pocket watch from his arms. The dark gold pattern on it shone unusually under the light. He placed the pocket watch on the table not far away and left.

Yang Dongqing kept yelling, but after a while, he still turned his attention to trigonometric functions, because he knew that Su Mu, a lunatic, could do anything.

"Phew! It's just a trigonometric function, very simple." He took a deep breath and reviewed the question carefully.

[It is known that in ΔΑΒC, ∠Au003d60°, au003d3, bu003d root 3, find the size of ∠B. 】

Time passes slowly, one minute, two minutes, three minutes...

"Ahhhh!! Fuck, fuck, fuck! How big is this B!"

There is a saying that goes well, people can do anything if they are in a hurry, but obviously this sentence is wrong, because they cannot solve math problems. No means no.

Fifteen minutes later, Su Mu gracefully walked into the dungeon with a cane, holding a crystal goblet filled with bright red wine.

"Classmate Yang Dongqing, do you have the answer?"

Yang Dongqing, who was addicted to mathematics, suddenly raised his head. At this time, his mental state was very bad. Bloodshot eyes were like spider webs. He kept mumbling: "sinBu003db×sinA÷a, which is equal to the root number 3 times sin60°......"

"Fifteen minutes are coming soon."

"Don't make any noise! ​​I'll calculate it soon, sinBu003d is one-half! Because a>b, so ∠A>∠B, and because sinBu003d is one-half, so..."

Yang Dongqing's expression suddenly shook, and he blurted out an answer: "∠Bu003d30° hahaha... I figured it out!!"

Bang bang bang...

Su Mu applauded with joy on his face: "Congratulations, classmate Yang Dongqing, you saved one of Miss Jasmine's fingers."

However, before Yang Dongqing could be happy for too long, Su Mu came up with another math problem: "It still takes fifteen minutes. If you can't solve it, then I will cut off one of Miss Jasmine's toes."

"Su Mu! You bastard! What on earth do you want to do!"

Su Mu smiled slightly. He found that Yang Dongqing's mental state was still very good and he still needed to do a few more math problems.

"Time limit is 15 minutes."

After saying that, he walked away on crutches.

Yang Dongqing, who was about to collapse mentally, had to turn his attention to new math problems after venting his anger.

After taking a quick glance, he felt his eyes go dark.

【1, 3, 8, 20, 48, 112, 256...

(1) Please find the general formula of this sequence.

(2) Find the 20th item of the sequence.

(3) Starting from which number in this sequence is greater than 10,000? 】

"Su Mu! I****"

...

...

The next day, Yang Dongqing had a sleepless night.

Because he did math problems all night, his mathematical attainments have been greatly improved. He is now proficient in trigonometric formulas, arithmetic sequences, geometric sequences, linear equations of two variables, etc... Advanced math secrets.

At this time, his entire mental state was close to collapse. His eye sockets were sunken, his face was numb, and his eyes were dull.

The group of young ladies from yesterday were here again, but no matter how they danced, they couldn't make Yang Dongqing's eyes move at all.

In the monitoring room, Su Mu saw that the fire was finally almost ready for hypnosis.

Everything he had done before was destroying Yang Dongqing's spirit, especially the last math problem. Only a bad student could understand the pain of racking his brains but not being able to figure out the answer. Yang Dongqing happened to be a bad student.

The mental resistance of extraordinary people is very high, and their mental resistance must be weakened to the extreme to ensure the success rate of hypnosis.

What he was going to do this time was deep hypnosis, not the previous psychological suggestion.

Psychological suggestion is only a shallow level of hypnosis. The hypnotized subject still maintains his own thoughts, but will make corresponding choices or reactions under psychological suggestion.

Deep hypnosis, on the other hand, is like hypnotizing people from the Viper Gang, completely distorting the thoughts of the hypnotized subject. However, this deep hypnosis is not long-lasting and needs to be deepened every once in a while. Perhaps after his mental power becomes stronger, Only then can you achieve permanent hypnosis like a stamp of thought.

Boom!

The dungeon door was opened again.

Yang Dongqing, whose eyes were blurred, heard the sound of opening the door, and his whole body was shaken like a conditioned reflex. Extreme panic appeared on his face.

"No... don't! I don't want to do math problems anymore! Ugh..."

As he said this, Yang Dongqing actually started retching.

Su Mu was very satisfied with this, "Classmate Yang Dongqing, it seems that you have fully absorbed and digested the mathematical knowledge, and now you are a little overwhelmed.

It seems we can proceed to the final stage. "

Yang Dongqing seemed not to have heard anything, and could not help but mutter: "sin, cos, tan, cot..."