And they are free. "Introduction to Trigonometry is where I teach people about the trig functions."

VOA: standard.2010.03.26

If you go back to your trigonometry, That's another example where knowing the trigonometry is very helpful.

回顾一下学过的三角函数,这个例子再次佐证了熟知三角函数是多么有用

耶鲁公开课 - 基础物理课程节选

You've got to know your trigonometry, you've got to know what's a sine and what's a cosine.

你们得懂三角学,你们得知道什么是正弦什么是余弦

耶鲁公开课 - 基础物理课程节选

If you don't know how to measure anything, you are doing algebra and trigonometry.

如果你不知道如何进行测量,你就是在研究代数或者三角函数了

耶鲁公开课 - 基础物理课程节选

You can square this guy and add it to the square of this guy and you will find, using the magic of trigonometry, that this is true.

你可以把这两个式子平方相加,再用一下三角函数的性质,你会发现这是正确的

耶鲁公开课 - 基础物理课程节选

Trigonometry functions you know all the time.

三角函数必须随时会用

耶鲁公开课 - 基础物理课程节选

This vector i prime has got a horizontal part, This kind of trigonometry you should know all the time.

矢量 i' 有一个水平方向的分量,这类三角关系你们应该已经很熟悉了

耶鲁公开课 - 基础物理课程节选

You can see from trigonometry and the length of the vector I'm going to call by A.

可以用三角的知识,然后我把矢量的模长记为 A

耶鲁公开课 - 基础物理课程节选