Strengthening and Upgrading the Opening God-level Options

Although Zhao Long stopped talking, his expression showed that he was very dissatisfied.

Li Yan glanced at everyone and said, "I think some of you are very unconvinced by my words, okay, then we will demonstrate genius and ordinary on the spot."

"I’m going to have a question now, everyone can count it, and see how long it takes you to calculate the correct answer?"

Known function F(X)=asin2x+cos2x, and F(3/π)=2/√3-1

(Seek) The value of A and the maximum value of F(X); (2) Ask in which interval F(X) is a subtractive function.

Li Yan wrote this question on the blackboard, and then looked at the crowd and said, "You can now calculate and see how much time you spend."

As soon as Li Yan's words fell, many people took up the pen and counted them up, one by one with a serious expression, and his brain was running fast.

Five minutes later, someone finally raised his hand and gave the correct answer. At this time, Li Yan walked in front of Ye Xuan and tapped his finger on the table.

"Ye Xuan, you wake up." Li Yan said, looking at Ye Xuan.

Ye Xuan's fingers flickered, and then he raised his head and opened his eyes vaguely.

"Teacher, do you have anything?" Ye Xuan yawned and said.

"Ye Xuan, you can calculate this question on the blackboard." Li Yan said to Ye Xuan.

Ye Xuan glanced at the blackboard.

"Ding! The host browses math questions, math skills +1..."

"Ding! Trigger Intermediate Mathematics Ability, analyzing the problem... The problem analysis is completed, the answer is being sent..."

Ye Xuan picked up the pen on the side and quickly wrote the answer on the paper.

It is known that f(x)=asin2x+cos2x and f(π/3)=(√3-1)/2

(√3-1)/2=asin(2π/3)+cos(2π/3)

√3-1/2=a*√3/2-1/2

a=2

y=f(x)=2sin2x+cos2x

y-2sin2x=cos2x=√[1-(sin2x)^2]

y^2+4(sin2x)^2-4y*sin2x=1-(sin2x)^2

5(sin2x)^2-4y*sin2x+y^2-1=0

The discriminant of the above equation with unknown number (sin2x) △≥0, that is

(4y)^2-4*5*(y^2-1)≥0

y^2≤5

-√5≤y≤√5

Answer: a=2, maximum value of f(x)=√5

"Teacher, I have written the answer. Please take a look." Ye Xuan handed the written answer to Li Yan.

Li Yan picked up the answer and saw a satisfied smile on his face, turned and walked towards the podium.

"The other students' answers are correct and wrong, but it will take five minutes to answer them at the fastest, but Ye Xuan takes less than a minute from reading the question to writing the answer. This is the difference between ordinary and genius."

"Do you have any disappointment?" Li Yan looked at everyone and said.

At this time, where did anyone dare to say anything? In their view, this guy Ye Xuan is simply against the sky. It takes no more than a minute to read the answer to see the question. No wonder Li Yan will attach great importance to Ye Xuan.

Zhao Long's expression was awkward, and he finally sat down.

"Okay, since you all don't speak anymore, then let's continue with the class." Li Yan's words dropped and he picked up the math textbook to continue the knowledge explained just now.

As for Ye Xuan, of course, he continued to sleep on the table. There was no way, he was too sleepy.

"Bell Bell Bell..." Li Yan stopped as the bell rang, and he left the classroom after a few words.

"Ye Xuan, you are so amazing, my God." Zhao Qiang ran to Ye Xuan's position with excitement and said.

"Yeah Xuan, no wonder the class teacher attaches great importance to you. You have nothing to do in class. This genius is a genius. The ordinary people really can't touch the field." Wang Fugui expressed emotion with a look.

"That is of course. Ye Xuan said that he is the first place in the math competition. This is a symbol of strength. Some people are unclear about their position and want to embarrass Ye Xuan, which is really ridiculous." Chen Li said with a smile.

"Axuan, how are you, do you feel more comfortable?" Liu Yiyi asked with a concerned expression.

Ye Xuan rubbed his eyes and said, "I'm fine, only I slept too late last night, so I didn't have a good rest."

"By the way, how have you completed the question I gave you?"

"Ye Xuan, this is my homework. Do you have any mistakes?" Zhao Qiang said with a smile, and then placed his homework in front of Ye Xuan.

"Ye Xuan, this is mine, and I have completed it." Wang Fugui also took out his homework.

The other three also handed over their work to Ye Xuan. Ye Xuan took a little time to check it carefully. He had to say that this situation was much better than he thought.

"Yiyi needless to say, she has no problems. On the contrary, the progress of the four of you is very great. If you continue to develop according to this trend, your monthly exams will definitely achieve good results." Ye Xuan gave a lot sure.

Zhao Qiang and others laughed very happy when they heard it. After all, they also want to get good grades and want others to be impressed.

"Ye Xuan, don't you really say that since I listened to your lecture, I found that there are a lot of things that I understand at a glance, so when I did the question last night, I found that my idea of ​​solving the problem was clearer and faster than before. Also improved a lot."

"Yes, yes, I have this situation too. I used to be dizzy when I looked at the question. Now I like the question very much. After reading the question, I think about it and I know what to do. This really surprised me. ."

"Isn't it, Ye Xuan, you are so great, I have studied with you, and I find myself making great progress."

"..."

Several people gathered around Ye Xuan's position, and I discussed it one sentence at a time. At this moment, they really admired Ye Xuan's five bodies.

The nearby students became curious when they heard the discussion of Zhao Qiang and others. They all gathered around. After learning the situation, they really envied Zhao Qiang and the others.

"Zhao Qiang, you are so lucky, if only I could have a group with Ye Xuan."

"Isn't it? If I could get Ye Xuan's make-up, my grades would improve very quickly."

"No wonder the class teacher attaches so much importance to Ye Xuan. I also pay attention to my words."

Zhao Long saw Ye Xuan once again become the focus of everyone's discussion, and his face was terrible and gloomy.

"This **** Ye Xuan, what the **** is going on, I haven't seen him so powerful before, was it all disguised before?" Sun Li said, touching the back of his head, he didn't want to understand for a long time.

"Who knows this, but Ye Xuan's strength in learning is really strong at this time, I don't want to admit it." Li Wei sighed.

"Yeah, maybe as the class teacher said, Ye Xuan is a genius, not something ordinary people can touch."

Zhao Long heard more and more fire.

What happened? How did these guys change direction and praise Ye Xuan?

"What do you mean? It means that I am not as good as Ye Xuan?" Zhao Long said coldly.

"Brother Dragon, how is this possible? In my heart, Brother Dragon is the most powerful, Ye Xuan is nothing." Sun Li said quickly.

"Yes, yes, Long Brother is the best. Ye Xuan couldn't compare with Long Brother."

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