# Cosine (extract from undergrad DLSP25)

## Метаданные

- **Канал:** Alfredo Canziani (冷在)
- **YouTube:** https://www.youtube.com/watch?v=IKjd34ZsFVw

## Содержание

### [0:00](https://www.youtube.com/watch?v=IKjd34ZsFVw) Segment 1 (00:00 - 01:00)

Do you know how the cosine is going? Okay. Show me with your two fingers how the cosine goes. So, this is the x-axis, this is the y-axis. No, show me first the y-axis. And now I would like to see how the cosine is going. Okay, so what I want to see is going to be those two fingers moving at the same time. Because if it does that one, what does it mean? Oh! Why is that? It goes like that, yes… symmetric… A better word in mathematics? Even! It's an even function! Right. The cosine is an even function, whereas the other one? Okay, odd function. And if you take a derivative of an odd function, what you get? even function? Okay, you know. My professor didn't know. Anyways, so this one goes like whooo, and then whooo.

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*Источник: https://ekstraktznaniy.ru/video/22334*