oh yeah. last time u ask me why i have to take longer to
study.
cos got two reasons:
- refine thought process including error inspection and
correction
- if there is something worth investigating, i may end up spending
1-2 hours to investigate.
for e.g., there is such a equation sin(x)*cos(x)*tan(x). why at
pi/2, the value of f(x) is 1 if cos(pi/2) = 0. still trying to find
the explanation for this.
it's like u dun wan to pass only, u wan to be a master in the
subject. yeah.
so my fren tell me to be teacher suan le. 
