When Lu Yuanhang was holding a pen and writing the topic in his notebook, Tian Lanfang sat beside him and lowered his head and counted his fingers.

This was the most embarrassing moment when she came to the 80s.

The ceiling fan hanging from the ceiling rotates rapidly, bringing a cool breeze and a faint fragrance from time to time.

That's the smell of bee flower shampoo on Lu Yuanhang's hair.

She hadn't been so close to the opposite sex since she came to the '80s, and her face burned at the thought of her squirming and singing in the house that night.

Thinking about getting up and leaving, her legs couldn't move as if they had been immobilized, and beads of sweat appeared on the tip of her nose in a hurry.

Lu Yongchun took two bottles of orange water and put them in front of her and Lu Yuanhang, he was worried about the two sleeping children, got up and left and walked to the bedroom to check the children's condition.

In the spacious living room, only Lu Yuanhang, who bowed his head and worked hard to write, and Tian Lanfang, who sat on pins and needles, were left.

Lu Yuanhang wrote a math problem on a piece of paper, and according to the foundation that Tian Lanfang did not graduate from primary school, he did not have much difficulty. After all, her foundation is there, he just wants Tian Lanfang to know that the college entrance examination is difficult, so that she can accept his arrangement and study seriously as a transfer student in No. 1 Middle School.

The known function f(x)=2snsx+s²x-1

Find the maximum value of the function f(x) and the corresponding value of x.

Lu Yuanhang thought, this question is a topic of the first year of high school, and there is naturally no problem in learning advanced mathematics, but for Tian Lanfang, who only has a primary school cultural foundation, it is tantamount to a book from heaven.

Lu Yuanhang, who used to be the top science student in the Lianhua County College Entrance Examination, wrote vigorously and powerfully, and should have practiced Pang Zhonghua font.

Teachers from the same school?

Tian Lanfang was overjoyed.

Lu Yuanhang finished writing the topic, raised his head with a smile, and handed the notebook with the topic written in front of Tian Lanfang.

At a glance, I saw Tian Lanfang with beads of sweat on the tip of her nose and a scarlet face.

He thought that she must have been embarrassed to look like this because the topic was difficult and embarrassed.

He just wanted to comfort Tian Lanfang not to be nervous, and in the afternoon he took her to his former high school homeroom teacher, Mr. Wang, to arrange for the transfer of study, and Tian Lanfang, who was twisting his fingers and blushing, whispered a sentence that almost made Lu Yuanhang fall off the sofa in surprise.

"The maximum value of f(x) is √2, and the corresponding value of x is ......."

Tian Lanfang took the pen from Lu Yuanhang's hand and quickly wrote out the solution process under the question.

∵ f(x)=sn2xs2x=√2sn(2x+π/4)≤√2, so that 2x+π/4=2kπ+π//2,k∈z, x=kπ+π/8,kk∈z, the maximum value of the ∴ function f(x) is √2, and the corresponding value of x is: x=kπ+π/8,k∈z.

The handwriting is strong and powerful, the steps are rigorous, the writing is serious, and the answer is completely correct!

Lu Yuanhang's eyes widened in surprise, and he stared at Tian Lanfang in disbelief.

How is this possible!

As the top science student in the Lianhua County College Entrance Examination that year, when he was in the first year of high school, he made a mistake in this question, and he seriously revised it three times in the revised version of the wrong question, so he still remembered this question vividly.

This question examines the application of the sine formula for double angles, the monotonicity of compound trigonometric functions, the image and properties of sine functions, and is an examination of the most basic knowledge.

But for Tian Lanfang, it should be like a book from heaven, and she answered so easily! It's like the answer is hidden in your brain, and you can just take it out and write it down at any time!

This hand, with his font master, is the same font as Pang Zhonghua!

This, this, this...... Unscientific!

After all, Tian Lanfang's foundation is there, and primary school knowledge can't touch functions at all, not to mention this writing, this problem-solving step is rigorous and seamless, no matter how you look at it, it is written by people with higher education!

At the same time, Tang Yue and Li Jianning served food to the dinner table, and saw sitting on the sofa staring at their mother in disbelief with round eyes

Lu Yuanhang, and then glanced at the mother who bowed her head and looked shy, Tang Yue and Li Jianning glanced at each other, and the little two smiled evilly.

It must be the eldest brother who discovered the difference between the genius doctor and the doctor.

The mother knows how to heal, can sing, and can say some amazing famous sentences at every turn, which has become the norm for the two of them.

So no matter what the mother is good about, it's a normal thing for them.

Proper treasure mother.

From the moment they entered the Lu family, the two of them found that something was wrong with their mother.

The eldest brother of the Lu family is handsome, has a good job, high education and strong ability, and is still an infatuated man who has been widowed for many years and has not been married.

Looking at the current state of the two people, it is really a bit of a feeling of hating each other, and the delicate appearance of the mother's shy answer is no different from the big girl in love!

If the mother and the eldest brother can really come together, it will really be a happy event for relatives and relatives.

It's just a bit of a bad guy......

"Yuanhang, what about your father, it's past one o'clock in the afternoon, and I haven't eaten lunch, so call your father to come over......

Wang Lianhua came out of the kitchen with a braised carp, her hot hair was soaked with sweat, and she hurriedly shouted.

Li Jianning took the carp plate and brought it to the table, while Tang Yue took a towel, gently wiped the sweat beads on her face for the godmother, and said that the godmother had worked hard, and there were several more people in the family today, and the tired godmother was busy and had no time to sit down.

Wang Lianhua's face was happy to become a lot of flowers, saying that it would be good if the house was so lively every day, she was tired and breathless, she was willing, she liked the lively and lively house.

Lu Yongchun came out of the house and said that the two children were still asleep, and they would make some food for the children when they woke up.

Wang Lianhua and Lu Yongchun sat at the head of the table, Tang Yue and Li Jianning sat down next to Wang Lianhua, and Lu Yuanhang and Tian Lanfang sat down next to Lu Yongchun.

"Dr. Tian has studied trigonometric functions? Have you ever practiced calligraphy? The problem was done quickly and correctly, the writing was neat, and there were no mistakes at all in the steps of solving the problem! If I hadn't corrected this question three times in my freshman year of high school, I would have done it slower than Dr. Tian!"

Lu Yuanhang was still excited, and showed the notebook with the steps and answers to the problem to the big guy.

Tang Yue glanced at the mother sitting opposite, the mother's face was shy, she changed her big grin when she was in the village, and pursed her lips and smiled embarrassedly at Lu Yongchun and his wife.

"A few days ago, Yueyue helped me borrow Youqing's review materials, and I had time to read some ......."

"That's amazing!"

Lu Yongchun took the notebook from Lu Yuanhang's hand and put it in front of him to look at it carefully.

What a surprise!

Tian Lanfang's excellence is far beyond the scope of his cognition!

"I was a science expert back then, but now that I pick up this math problem, he knows me, I don't know him!"

His face was happy, and his eyes were full of admiration when he looked at Tian Lanfang.

"At first, Lan Fang said that she wanted to study at home to take the college entrance examination, and I felt that this matter was a bit hanging! However, looking at the current situation, after passing the one-year self-study exam, Lan Fang has no problem applying for the medical school in Beijing! That's it! Voyage, you have to take Lan Fang to Teacher Wang's place in the afternoon, and strive to implement Lan Fang's college entrance examination quota! Take two bottles of lotus and brew them! That's what the old guy does!"

Lu Yongchun was happy, picked up the wine cup and drank it.

"No, no, there's one more thing......

Tian Lanfang hurriedly waved at Lu Yongchun.