This is one question that I know ALL my students can excel in doing, that is solve . So I’m not interested in showing you how to solve such problems, but I want to explain a particular step which you introduce in your working. So let’s take a quick look at the solution first.
So here, we note that we introduced , but how is ?
Intuitively, for is simply full circle. So we are really just turning full circles about the same point here, which is why we are still referring to the same number.
I will do a simple mathematical proof here too.
(using formulas in th MF15)