Sine of 30 degrees. Sine of 30 degrees.

sin 30 度。这是因为这个向量。

Opposite over hypotenuse is equal to sine of an angle.

斜边分之对边 的值即是 sin 函数的值。

This is equal to the sine of theta.

两同时乘重力的大小。

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

但让我们再来说说正、余和对数函数。

So this is going to be equal to the sine of theta.

两同时乘重力的大小。

So what's the sine of 30?

sin30°是多少？ 实上 我们写到这里？

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

但这个正波对所有医务工作者来说都是巨大的工作量。

What's the sine of 30 degrees?

sin30度等於多少？

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

我们生成这个正信号，然后利用它来测定洞穴的声音特性。

The force required to lift is reduced by the sine of the angle of the stairs, call it 30 degrees, so, about half.

运上去所需的力度按梯角的正值减少，30度角的话就减少一半力气。

It found favour, and in particular it accelerated the completion of a genome-sequencing project for the animals-a sine qua non for any self-respecting model organism.

这一想法得到了青睐，尤其是会加速动物基因组测序项目的完成，这是任何靠谱的模式生物的必要条件。

This should start to become a little second nature to you that this is T1 sine of 30, this y component right here.

这应该对你来说很自然这是T1sin30° 这个y分量。

And that motion is mathematically identical to the motion of something bouncing up and down on a spring with a linear restoring force - also sine waves over time.

这种运动在数学上和一个物体在弹簧上线性恢复力（随时间变化的正波）上下弹跳的运动是一样的。

So, for example, I don't think that being a math person means that you can recite the formulas between the sines, cosines, tangents and to use logarithms and exponentials interchangeably.

所，比如，我认为成为数学家不是指你要能背诵正、余、正切的函数公式和转化运用对数和指数。

I studied trigonometry for a month. I sometimes dreamed about sine, cosine and tangent, about mysterious angles and concussed computations, but for all this I made no real progress. I could not self-teach trigonometry. But I knew someone who had.

我学习了一个月的三角学。我有时会梦见正、余和正切，梦见神秘的角度和让我绞尽脑汁的计算，尽管如此，我并未取得任何实质性进展。我无法自学三角学，但我认识一个自学成功的人。