But let me go back to these sines, cosines and logarithms.

但让我们再来说说正弦、余弦和对数函数。

I actually write it with these little ridges in it, so SOH... CAH... TOA.

我写的时候会写成这种三角的形状，这是正弦，余弦，正切。

I get it! Sin is opposite hypotenuse... Yes.

我懂了，正弦是对边比斜边。是的。

We draw them as sine waves, as if something's going back and forth or up and down.

我们把它们画成正弦波，就有东西在前后或上下运动。

But that sine wave is just gonna be a tremendous load on all the health care providers.

但这个正弦波对所有作者来说都是巨大的作量。

So we generate this swept sine wave and we use that to capture the acoustic of the cave.

我们生成这个正弦扫频信号，然后利用它来测定洞穴的声音特性。

So each of the x sine in the sample.

所以样本中的每个 x 正弦。

Here is a pure 261 hertz sine wave.

这里是一个纯261赫兹的正弦波。

And now for the Y direction we can use the definition of sine of theta.

现在对于 Y 方向，我们可以使用正弦函数的定义。

I'm gonna use sine of theta, oh sorry, sine of phi.

我要使用正弦 theta， 哦抱歉，正弦 phi。

You should learn how to use the sine bar .

你应该学习如何使用正弦规。

I don't have the slightest idea what sine and cosine mean.

我根本不知道正弦和余弦是什么意思。

We're picking up our old ECS example project, the sine wave of cubes.

我们正在使用旧的 ECS 示例项目，立方体的正弦波。

Sine theta equals opposite over hypotenuse.

正弦θ等于对边除以斜边。

I thought the x-direction used  cosine and the y-direction used sine?

我以为 x 方向使用余弦而 y 方向使用正弦？

The force of gravity parallel equals mass times gravitational field strength  times the sine of the incline angle.

平行重力等于质量乘以重力场强度乘以倾斜角的正弦值。

This means that the circumference of the band should  be 2 pi times the sine of that angle.

这意味着带的周长应为 2 pi 乘以该角度的正弦值。

First of all, electromagnetic waves do not travel in a single direction in a sinusoidal fashion like this.

首先，电磁波不会这样以正弦方式沿单一方向传播。

Thus, this visualization of a directional sinusoidal wave is lacking, yet there are still merits to the vis-ualization.

因此， 这种定向正弦波的可视化虽然有所欠缺，但仍然有可视化的优点。

It's all just trigonometry, connecting sides and angles through sines and cosines.

这是三角学，上边 以及跨正弦和余弦的角度。