I'm having one of those moments staring at some working in my textbook that I just can't get my head around. I'd rather have a poke in the right direction than a straight solution, but whatever is easier for you guys!
There are two steps in this working, I just cant see how to get from one to the next. I've tried writing it out in as many ways as I can think of, but I know I'm just missing that one tiny connection!
From this to this
In fact, ignore the 1/200. It's just the second quotient I'm struggling with...