I presume that the author immediately saw the in both numerator and denominator and, of course canceled them. Would you prefer " " or "1"? Also, since , which is a much simpler form.4. =
QUESTION TWO. I would stop sympifying here. However the question went on to state . Again I understand the HOW. What I'm tring to understand is WHY (i.e. how did the author know to simplify it further)?
I hope that makes sense.