My roommate is not cute at all

head.

Before the monthly exam, Shen Yuezhi seemed to have returned to the state she had in mid-August.She spends all her time endorsing the book, and the only way to relax is to think, if she wins the bet, Xie Qingyang really writes a "love letter" to herself... what will she write?

Shen Yuezhi felt that Xie Qingyang would not identify himself as the person described in that letter.She will probably blur the person, and even blur the emotion contained in it.

As for whether it will directly come up with a "three-moving letter" or write a heart-shaped line formula, it seems that it is not sure.

Thinking of this, Shen Yuezhi felt a little regretful, she should have said more in detail before.

But at that time, she never thought that Xie Qingyang would agree to herself.

She was doing math problems.This morning, I started to talk about the topic of trigonometric functions. Gao Yong still remembered the question he asked them before. The first sentence in the opening sentence was: "What is tan90°?"

There was silence in the audience, Gao Yong ordered Xie Qingyang.

Xie Qingyang didn't stand up, and replied directly: "It doesn't exist."

Gao Yong smiled and asked, "Now, do you think it's the subjunctive mood that's difficult, or the value of trigonometric functions?"

Xie Qingyang said calmly: "There is no need to memorize trigonometric functions. If you really don't remember it, just draw a picture."

Gao Yong slapped the table, and his tone was full of the feeling of encountering an old acquaintance in a foreign land: "That's right. Let me tell you, I was not 27 in mathematics at the beginning. When I made it up, there were too many things to memorize, such as the value of trigonometric functions. , and the following formulas, I didn’t memorize them all, I just memorized how to deduce them.”

He turned around and wrote on the blackboard: sin^2α+cos^2α=1, tanα=sinα/cosα

Then the knuckles of that finger tapped on it: "But the two formulas still need to be memorized. Okay, let's talk about some definitions first."