His idea was, the formula written for the opposite one will have the opposite angle; That turns out to be the correct answer.

他的方法是,反过来的方程,以相反的角来表示,那就能推出正确的答案了

耶鲁公开课 - 基础物理课程节选

We'll adapt the convention that we'll measure angle in a radian.

我们要适应它,以后都用弧度来表示角的大小

耶鲁公开课 - 基础物理课程节选

So we have if, and that is followed by, I'm going to use angle braces here just to indicates something goes in here, some test followed by a colon.

那么我写了if，后面跟着，我这里会用一个角括号,来代表这里有些东西，冒号后面跟着一些测试。

麻省理工公开课 - 计算机科学及编程导论课程节选