Strengthening and Upgrading the Opening God-level Options

Although Zhao Long didn't speak anymore, his expression showed that he was very unconvinced at this time.

Li Yan glanced at the crowd and said, "I see that some of you are very unconvinced by what I said, okay, then we will demonstrate on the spot the genius and the ordinary."

"I'm going to give a question now, everyone can do the math and see how long it will take you to figure out 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 what interval F(X) is a decreasing function.

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

As soon as Li Yan's words fell, many people picked up their pens and counted, each with a serious expression, and their brains were running fast.

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

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

Ye Xuan's fingers trembled, then he raised his head and opened his eyes in a daze.

"Teacher, what's the matter with you?" Ye Xuan said with a yawn.

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

Ye Xuan glanced at the blackboard.

"Ding! The host browses math problems, math ability +1..."

"Ding! Triggering the intermediate math ability, analyzing the question... The question is analyzed, and the answer is being delivered..."

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 whose unknown is (sin2x) △≥0, namely

(4y)^2-4*5*(y^2-1)≥0

y^2≤5

-√5≤y≤√5

Answer: a=2, the maximum value of f(x)=√5

"Teacher, I've already written the answer, take a look at it." Ye Xuan handed the written answer to Li Yan.

Li Yan picked up the answer and looked at it, with a satisfied smile on his face, turned around and walked towards the podium.

"Other students have correct answers and wrong answers, but it takes five minutes to answer them at the fastest. However, Ye Xuan took less than a minute to read the question and write the answer. This is the difference between ordinary and genius."

"Are you still unconvinced?" Li Yan looked at the crowd and said.

How could anyone dare to say anything at this time? In their opinion, this guy Ye Xuan is simply against the sky. It doesn't take a minute from reading the question to answering the question. No wonder Li Yan attaches so much importance to Ye Xuan.

Zhao Long's expression was a little embarrassed, and finally he could only sit down.

"Okay, since you are not talking anymore, let's continue the class." Li Yan picked up the math textbook and continued the knowledge explanation just now.

As for Ye Xuan, of course he continued to sleep on the table, there was nothing he could do, he was really sleepy.

"Ring Ling Ling ..." Li Yan stopped when the bell rang for the end of get out of class, and after he said a few words, he left the classroom.

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

"Yeah, Ye Xuan, it's no wonder that the head teacher attaches so much importance to you. You have nothing to do with sleeping in class. This genius is a genius, and ordinary people really can't reach it." Wang Fugui sighed with emotion.

"Of course, Ye Xuan is always the first place in the math competition. This is a symbol of strength. Some people can't figure out their position and want to embarrass Ye Xuan. It's really ridiculous." Chen Li said with a smile.

"Axuan, how are you, are you feeling better?" Liu Yiyi asked with concern.

Ye Xuan rubbed his eyes and said, "I'm fine, but I slept too late last night, so I didn't rest well."

"By the way, how did you finish the question I gave you?"

"Ye Xuan, this is my homework, do you see anything wrong?" Zhao Qiang said with a smile, and then put 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 homework to Ye Xuan. Ye Xuan took a moment to check it carefully. He had to say that the situation was much better than he imagined.

"It goes without saying that Yiyi has no problem with her. On the contrary, the four of you have made great progress. If this trend continues, you will definitely get good grades in the monthly exam." Ye Xuan gave a great deal of support. affim.

Zhao Qiang and others laughed very happily when they heard it. After all, they also wanted to get good grades, and they also wanted to impress others.

"Ye Xuan, don't tell me, since I listened to your lecture, I found that I understood a lot of things at a glance, so when I was doing the problem last night, I found that my problem-solving ideas were clearer and faster than before. It has improved a lot.”

"Yes, yes, I also have this situation. I used to get dizzy when I saw the question, but now I like it very much when I see the question, and after reading the question, I think about it carefully and then I know what to do. This really surprised me. ."

"That's right, Ye Xuan, you are really amazing. Learning with you, I found that I have made great progress."

"..."

A few people gathered around Ye Xuan's position, and I discussed it one by one. At this moment, they really admired Ye Xuan.

The nearby classmates became curious when they heard what Zhao Qiang and others were discussing. They gathered around one after another. After learning about the situation, they really envy Zhao Qiang and the others.

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

"That's right, if I can get Ye Xuan's make-up class, my grades can improve very quickly."

"No wonder the head teacher attaches so much importance to Ye Xuan. I also attach importance to my words."

Zhao Long saw that Ye Xuan became the focus of everyone's discussion again, and his face was terrifyingly gloomy.

"This damn Ye Xuan, what the hell is going on with him, I've never seen him so powerful before. Could it be that he was pretending before?" Sun Li touched the back of his head and said, he thought about it for a long time and couldn't figure it out.

"Who knows this, but Ye Xuan's strength in learning is really strong at this time. It's impossible to admit it or not." Li Wei sighed.

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

The more Zhao Long listened, the more angry he became.

What's the situation, how did these guys change direction and praise Ye Xuan?

"What do you mean? You mean I'm not as good as Ye Xuan?" Zhao Long said coldly.

"Brother Long, how is this possible? In my heart, Brother Long is the most powerful. What is Ye Xuan?" Sun Li said quickly.

"Yes, yes, Brother Long is the best. Ye Xuan can't be compared with Brother Long at all."